Hey there, everyone.
Pretty sure this is a fake/repro, but it was free so what the heck.
Barrel is blocked, it is stamped "Japan" on the left side directly under the toggle knob, stamped "P.08" right below that, and is stamped "SAFE" right on the safety latch (see photo). It has a serial number, but no proof marks or manufacturer stamps.
Any info regarding origin and whether it is worth putting a new barrel on to shoot it is appreciated, as is the time you all give to this site.