Froggy Bottom Model F12 Steel String Acoustic Guitar

The Froggy Bottom F12 Model – a full-sized 16” guitar with 4.125” depth (significantly shallower than dreadnoughts) – was inspired by the instrument resulting from the chance conversion of a broken Martin F-7 arch top back in Greenwich Village of the 1960s.

In 1965, someone brought a old Martin F-7 with a trashed top into Marc Silber’s shop in the Village, wondering if it could be salvaged. Marc replaced the original arch top with a flat top and what had been a rather pedestrian guitar got a lot more interesting. As the guitar made the rounds in the Village scene, it caught the attention of players and builders alike. People started bringing the old F-7s into Matt Umanov’s shop for conversion. Word got around. 

Froggy Model F12

These early conversions demonstrated the sonic virtues of reducing the volume of air in the bodies of larger instruments and altered the course of contemporary flat top guitar design.

The shallower depth of the Froggy Bottom F makes the instrument comfortable to play and contributes to the guitar’s exceptional string-to-string balance, clarity, and projection.

See also the F14 – a 14 fret version.

Will do anything you ask of it

The F 12 can and will do anything you ask of it. Don’t matter what, it does it.   The F is the best of both worlds to me, big or small body. It can run with a dread or sing with a 00 if called to do so.


F12 Model Specs

Body Width:
Body Length:
Body Depth:
4 1/8
Scale Length:
25 1/4
Nut Width:
1 3/4” (variable at no charge)

Model F12 Prices

These prices reflect only the basic grade and wood choices for this model. Our price list has prices for specific custom options. Our current prices, effective March 1, 2023, are subject to change without notice.

Model F12deluxe / limited
mahogany9510 / 10,885
rosewood9510 / 10,885
maple11,335 / 11,710
walnut11,270 / 12,645
koa12,480 / 13,855