What is it? CXCIX
 

Andy Dingley wrote:
1101 For squeezing something. Shotgun case reloading, to form the
top crimp?

Uh, it does bear a loose resemblance to a hand loading tool, but the ram
is dished in. It's not a roll crimp die by any means. It looks to have
the proper cut for a shell base to be slid in. There is some lettering
(I think) next to the pivot pin.