Cruso was a trade name used by either H&D Folsom or Crescent gun company for Hibbard, Spencer & Bartlett hardware distributors on shotguns sold by them.
The Cruso brand name came out in 1902 but I could not find how long it stayed in use by HS&B. Maybe until 1932.
Caliber?
It is a shotgun, isn't it?
Muzzle diameter would give an idea of the gauge.
Or if you knew somebody with a selection, you could try different shells in the chamber.