Martin Style 21 Guide

The zeros before the hyphen identify size. The number 21 identifies the style. Measure the lower bout and body length using the Martin model-number guide as a reference. A case label or family description may be useful history, but it can’t replace the instrument’s measurements.

Count the frets clear of the body from a square-on view. A slotted headstock often accompanies a twelve-fret guitar, but the body joint is the direct evidence. The neck or headstock can have been replaced, and later recreations can reproduce older appointments. Record the outline, joint and scale as separate observations.

Take the scale measurement from the nut’s bearing edge to the center of the twelfth fret and double it. The saddle includes compensation. This is especially useful when an instrument is described loosely as an “OM-size” guitar: body resemblance does not establish the model stamp or the scale.

The familiar Style 21 combination is spruce over rosewood with comparatively restrained decoration. Style 18’s familiar later combination uses mahogany back and sides, while Style 28 carries its own richer trim vocabulary. The small-body Martin history gives the broader comparison.

On earlier Style 21 guitars, herringbone can appear around the soundhole and in the back strip. That differs from the herringbone top border associated with early Style 28. The illustrated Style 21 archive documents those locations and later back-strip changes. Identify the actual piece of ornament before using “herringbone” as a model description.

Fingerboard ornament also changes by period. Photograph the full board, including the higher positions, rather than relying on one close-up of a marker. Replaced boards and later inlay work can alter the pattern. The model, serial and surrounding construction need to agree before the appointments are described as original.

Joe’s 1956 000-21 photographs show the model’s top and rosewood back without borrowing a Style 28 example. The owner-story page preserves the associated provenance. Use those images for visible comparisons; they don’t establish hidden bracing, wood thickness or the condition of another instrument.

The 0-21 needs its own size and period identification. Early examples can predate routine model stamps, while later entries include uncommon configurations. The early Martin guide explains the construction and marking evidence needed when a serial alone doesn’t name the model.

Joe’s 1930 example shows a twelve-fret body, slotted headstock and belly bridge. The dated bridge archive places that guitar beside other period designs. Its bridge belongs to that particular example; compare other 0-21s with their own period and repair history.

An early guitar’s bridge and top need an assessment of intended stringing and present condition. Existing steel strings don’t establish that a nineteenth-century or early-twentieth-century instrument was built for that setup. Check construction and repairs before increasing tension.

If a seller describes a rare fourteen-fret 0-21 or another unusual order, request the supporting records and measurements. The price source includes isolated configurations, but a listed variant cannot authenticate an unexamined guitar. The model line, body geometry and production evidence must support the specific claim.

The standard 00-21 has a long history as a twelve-fret rosewood guitar. Establish its period before comparing bridges, guards and hardware. Early instruments and later postwar examples can look related while having different internal construction and repair needs. The house small-body guide supplies that chronological context.

Record the top border, rosette and center strip on the back. Then inspect the bridge outline and saddle arrangement. A replacement bridge may preserve the overall twelve-fret appearance while changing original material or covering damage. The top’s finish around its footprint can help identify questions for an in-hand inspection.

Joe’s 1970 example supplies a cleaner later comparison. Its instrument description reports original-family ownership, little use and slight back-binding separation. That last detail belongs in the condition report even though the full guitar presents well.

The rosewood transition needs both dating and wood evidence. The house chronology places the change from standard Brazilian to Indian rosewood around 1969 to 1970. Photograph the complete back, both sides and the interior surfaces. Grain appearance from one photograph cannot establish species or rule out replacement wood.

The 000-21 designation appears in early production and later Auditorium groups. A familiar later fourteen-fret guitar should be compared with its own period, while an early twelve-fret example needs the corresponding construction research. The annual guide’s separate entries reflect those distinctions; they shouldn’t be joined into an assumed uninterrupted specification.

The 1956 owner-story guitar provides a useful later example. Count the frets clear of the body, note the solid headstock and compare its restrained top trim with the other Style 21 photographs. Read the original account for the documented history rather than inventing a story from the guitar’s wear.

A 000 body outline alone doesn’t make the instrument an OM. Use the stamped model and measured scale, and refer an original OM claim to the OM-28 identification guide where appropriate. Modern Custom Shop or other OM-style builds need their own factory designation.

When an unusual 000-21 is attributed to a small production run or special order, retain copies of the evidence. A family recollection, a serial lookup and a factory record are different kinds of support. State which one establishes the claim and leave unresolved details visible in the description.

Check these readings against Martin’s serial-number table. The annual entries are the last number used in each year. A correct date doesn’t verify the origin of the guard, tuners or other installed parts.

The neck-block guide explains the earlier marking patterns and routine model stamping from around October 1930. Keep the surrounding wood visible when photographing a block. An unusually tight crop can hide repairs, sanding or an impression that needs closer examination.

The 1936 00-21 photograph shows the bridge plate and adjacent braces. Request views of the same areas on the instrument being assessed. Scalloping concerns the brace’s profile, while X position concerns its location. Later shaving can alter one without moving the other.

Inspect the plate’s full outline, pin-hole area and any added cap. A larger replacement can cover damage that an exterior bridge photograph cannot show. Distinguish the plate from the bridge itself in the written report, and record patches, cleats or replaced braces separately.

Ask for photographs along brace edges and glue joints when a guitar is described as original inside. Fresh tool marks, uneven aging or unusual glue deserve investigation, but none provides a complete diagnosis from a single phone image. The interior inspection guide explains the broader comparison.

Modern Standard Series, Authentic, Golden Era, VS, Custom Shop and signature interpretations need the actual serial year and complete factory designation. A historical appearance or an old year in the model name describes a design reference, not necessarily the instrument’s manufacture date. Use the model-code reference and ask for factory documentation on a CUSTOM stamp.

A replacement neck, retop or altered trim can complicate an old guitar’s identity. Record the original body, installed components and evidence for the attribution separately. A repair doesn’t automatically change the maker, but it can remove features that previously supported a precise model description.

Follow the counterfeit inspection guide when markings and construction conflict. Obtain fresh photographs of the complete instrument and connect every detail view to it through visible grain and wear. A plausible serial or a familiar gold logo is only part of that examination.

Classical, tenor and plectrum variants have classical, tenor and plectrum references. Keep those designations intact rather than absorbing them into the six-string small-body price groups.