Savage Thompson M1, unknown markings?

[beginner]

Mysterious markings on a M1 Thompson; anyone able to identify them?

Thanks

In front of magwell:



Under barrel, near muzzle

[herd118]

Looks to be modern nitro proof marks (1980), perhaps from the country you reside.

[kanister]

Looks like Prague proof house mark.

[beginner]

Wow, you guys are good. Thanks, I will try to track down more details

There you go: http://www.shotguns.se/html/czeck_republic.html

[racefiets]

And maybe the dealer that sold it:
http://www.9mm.cz/index.html