Ulster Dates

Joined
Oct 26, 2021
Messages
13
Anyone have any info on how to date an Ulster. I’ve narrowed it down to post 1941 but coming up blank after that. Tang stamp reads
Ulster
Knife USA
And on the reverse
55D

Handle looks like the Bonite with the deer head in it.
I can attach a pic if someone will walk me through the process.
Thanks all.
 
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