Typotone, mouth blown free reed. Rectangular mother of pearl plate with corners rounded off. Brass reed, which is rectangular with a circular end where it is secured to the plate. The underside shows that two pins are attached (or part of) this circular section and continue to the back. The slot for the reed is rectangular and has been cut in two sizes. The top level is the size of the reed (13x3mm). Beneath this it widens out to 14x7 mm. Scratched into the lower surface down one side of the slot: 378 [pitch?], down other side: Cuisoliuol[?]
Typotone made by Pinsonnat of Amiens to a design patented by him in 1828.