ANONYMOUS was kind enough to write recently pointing out yet another well-preserved gem from the shop of William S. Tompkins, which sold at Cowan's 2008, Spring Firearms & Militaria auction, Apr 30 - May 2, 2008 for $1,150 (including buyer's premium). The drum is described as 16" x 14" with rosewood sticks. Geometric marquetry design on the front.
That it is a Tompkins is clear from the inlay work and the red, white and blue painted counterhoops. The hooks are consistent with other Tompkins drums. The snare mechanism could be after-market as my 1862 Tompkins drum #22 (photo below) has none at all. (Or Tompkins could have begun using them on later drums).