Looks like one of the Manu utilitarian shotguns put out by Cresent Arms, Stevens, or the like. These companies would contract out to anyone that ordered enough guns and would stamp whatever the buyer wanted on the gun.
I would guess it is from Cresent Arms as they were a significant player in that market. I would not rule out Stevens as it looks like one of their early models too. In any event, it looks to be a pretty decent example of a commonly seen gun of the early part of the last century.
Yep... let me know if you sell it...
