I've had this little jukebox m1 since the early 60's (i was in grade school) when my dad purchased it from the NRA for the out of line price of $20. It appears to be still in absolutely beautiful condition. The serial #1718416 is on it. It has a P in a circle mark on the front of the handguard which I'm understanding is a rebuild mark. Lots of Rock-ola stamps including the barrel.
I have a couple of current questions. The rear sight is not a flip up, but the peep hole is on a slider for range adjustability. Is this Rock-ola? The stock, on the left side has a stamp with a square and an RIA over an EB marking. Under the sling,it has something like a "THIMBLE" over a "TN". The right side of the stock has two different markings I can't make out. ?Not original stock? It also has a bayonet lug. Was this added in the rebuild?
We do every couple of years take it out and do some plinking. Shoots great without failure. I am really interested in any information on this. THANX BUNCHES from BAGDAD.....................ARIZONA
Welcome from Switzerland backroad. TN is TRIMBLE Nursery and Furniture Co. of Rochester NY. Your carbine went trough a rebuild. RIA is Rock Island Arsenal. Rock-Ola did not used type III barrel bands with the bayonet lug. Please post some pictures in the Rock-Ola section. Welcome again.
As RR1 said your carbine went through a rebuild like 98% of them did. That is when it was updated with the adjustable rear sight and the type 3 band with the lug and the stock was changed. The stamping on the left side is the rebuild mark and the stamping on the right side would be acceptance stamp when it was originally accepted by the military. Most of Trimble's production was for National Postal Meter but some were made early on for Underwood and some for Saginaw Gear.