1840's Martin & Coupa Alternate X Braced Spanish Style Guitar

This Martin has what I believe may be the first experimental variation of X-bracing,which appears at about the same time on a handful of Martins and Schmidt & Maul Guitars. 
One such Schmidt& Maul is dated 1845.

This example, which is quite close in size to a standard Size 2 Martin, also foreshadows a standard Martin Style 21, with simple, tasteful appointments including a herringbone
rosette and back strip and a top border consisting of simple light and dark lines.  The back is rosewood over mahogany veneer.

Body width: 11 15/16"

Upper body width:  8.5"

Body length:  18 3/8"

Upper body depth:  3 9/32"

Lower body depth:  4 1/8"

Neck width at nut: 1 29/32"

Neck width at 12th fret:  2 5/16"

Soundhole:  3 9/16"

Scale:  24.5"

String spacing at bridge:  2 5/16"

Top braces:  early experimental variation of X bracing with two outer blades of fan surrounding narrow X

Back braces:  2 wide 1/2" V shaped, 1 half round, and one  6" x 3/4" "floating" flat brace not extending to sides

Stamp:  "C.F. Martin New-York" on 2 3/4" shield shaped Spanish foot

Martin & Coupa label

This guitar has another variation of the "floating back brace" seen on several of Martin's "Renaissance" guitars, which does not extend to the sides.

Illustrated in Washburn & Johnston p. 36

Illustrated in Carter, p. 18


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