unusuall design?,,,about 5.5" long

That may an owner's mark.
The style of manufacture is often called Lancashire.
Great many exported from England and Germany a century or more ago.
American makers also used that technique.

Not Millers Falls, and it seems awfully clean for an owner's mark.  I'm not any kind of manufacturer-trivia guy, so don't know if there was a machinist's toolmaker with "Fall" in the name besides M-F.

I ran several different search patterns but didn't turn up any leads.   

are those marks,just not fully stamped..........i guess?

I looked through all 3 Cope machinist's tool books that I have, but did not find anything.