Robeson Pattern Number Question

[afishhunter]

Does anyone know how to de - cypher PRE-WAR Robeson model/pattern number tang stamps?

For example, what does "622110" on a no newer than 1939 large 2 blade 2 spring jack knife translate to?

The knife in question:

 

[Oldy]

my Robeson half whittler from that time period has tang number 622102 ,but I found a page about it but I can't find it again,I have an idea what they mean but with my memory it can't be trusted. The page was a catalog with the Robeson collection from that period, but I'm thinking 6 is bone ,I better stop there before I dig a bigger hole that I can't crawl out of lol.

 

[Luger1952]

00The first three numbers are for handle material, number of blades and lining and bolster material. So 6 is bone stag (yours is worm groove or Indian trail jigging), first 2 is for two blades and second 2 is for brass lining & nickel silver bolsters. Last three numbers are pattern numbers.

Your Robeson looks to be an English Jack. Got this info out of the book “Romance of Collecting” by Mrs. Dewey Ferguson.

Nice knife and hard to find!