I posted this in Knife Finds of the Day…. But this is a better spot to seek input.
Apologies if reposting is a sin.
I scooped a rusty bare headed jack from the junker bin at a local antique shop for $3 Canadian

After a bit of a scrub it revealed (on the clip blade) itself to be a Robeson/Shuredge/Rochester

The pen blade is stamped Robeson/Cut Co. There is no model number. The scales are a composite that looks like horn. The liners, and maybe the bolsters, are steel. It is a bit over 3 1/4” closed.
Any further information about this knife will be appreciated.
Thanks,
J