Modifications chez Martin au cours des ans en fonction des numéros de série

Infos issues du site provide net.

Important Serial Number Milestones.

439xx to 44362: October 1930 first time both the body size & style number stamped on neckblock above the serial number (exact serial number change unknown).
57305 = T frets first used and T bar first used (1934)
59044-61181 = Martin stamp in back of peghead discontinued (1935)
72740 = Change in nut width on 14-fret models from 1 3/4" to 1 11/16" (late 1939) on all non-slotted peghead models. Style 17 models with 14-fret body may have changed earlier.
80585 = Ebony neck reinforcement started to be implemented during WW2 (1942)
83107 = Last pre-WW2 style 45 guitar (1942).
89926 = According to Martin, this is the approximate last scalloped braced guitar made (late 1944). Though some models have been seen after this number with scalloped braces, and before this number with tapered braces. (For example #90014 appears to be the last D28 with scalloped braces, and D-28 #88112 had tapered braces.)
90021 = Snowflakes on D28 discontinued (1944). This is an approximate serial#.
98223 = Last style 28 guitar made with Herringbone trim (early 1947).
99992-100240 = Last style 28 guitars made with a "zipper back" center seam (mid 1947).
197207 = Bridge pin holes moved back 1/16" (1964).
200601 = short saddle bridge (1965).
205251 = 102C Grover machines on all "D" guitars (1965).
211040 = Boltaron bindings on D-28 and D-35 (1966).
212100 = Boltaron bindings on D-18 (1966).
213775 = Boltaron rosettes (1966).
215253 = New tape strips on sides (1966).
216736 = Bridge pin holes moved to center (1966).
217215 = Tortoise guards discontinued (1966).
220467 = Last hand stamped serial/model numbers (1967).
224079 = Kluson K324 tuners on all style 18 models (1967).
226969 = Grover v100 tuners on all 0,00,000 models (1967).
228246 = Square truss rod bar on D models (1967).
235586 = Rosewood bridgeplates on all guitars (1968).
242454 = Larger rosewood bridgeplates on all guitars (1969).
254497 = Last style 28 guitar made with Brazilian rosewood (late 1969).
254498 = East Indian rosewood introduced (1969, a model D-21).
255717 = First D-41 model with Indian Roseood.
256366 = First D-45 model with Indian Rosewood.
350287 = Plastic saddles on D-18 models (1975).
355357 = Plastic saddles on D-28 models (1975).
360970-365831 = Rosewood vertical sidestrips (1975).
370976 = Micarta nuts and saddles (1975).
447004 = Self-adhesive pickguard trial (1984).
447501 = Last glued-down pickguard in regular production (1984).
453181 = Adjustable truss rods gradually implemented (1985).
478093 = Maple bridgeplates on all guitars (1988).
737277 = Last HD-28LSV with an Adirondack top (2000). Sitka spruce was used in regular production thereafter.


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