NGC MS 64 (6639729-012).
Av. Around round central hole: PROJECT / T - M / NICKEL.
Rv. Around round center hole, Mercury representing Commerce and allegory representing Industry, below 4 and between them a cartouche with (date).
GEM.259.3 v. (ND but the photo shows a date) - VG.4110 - Maz.2318 ; Nickel silver - 3.30 g - 22.5 mm - 12 h