Odd 1917 Erfurt barrel proof mark
 

I think I posted this long ago, but no one knew what it was. Took it up to Simpsons and he had no clue either.
http://i.imgur.com/7gprz7b.jpg
http://i.imgur.com/7RrdryO.jpg
http://i.imgur.com/jVfuCJz.jpg

Any markings under the barrel?

Standard markings, barrel is numbered to the gun.
http://i.imgur.com/fihXAvF.jpg
http://i.imgur.com/jVfuCJz.jpg

Doug,
I've seen pictures of that mark, but can't remember where - I am straining to remember that it may be related to Tikka?

Perhaps it will come to me. CRS strikes again.

There are no halos around the frame numbers suggesting refinish. Could the T come from the rebuild?
Also, is there a bore diameter under the barrel?
dju

I thought it looked like a little hammer, like blacksmiths use. :confused:

Third party inspeciton marking? Maybe Finland or ??? , inspected and approved/repaired before refinishing.

I've looked in all (both) marking reference books I have, and the closest is a Finn marking, of a T in a circle and later two "L" lookingmarks, but upside down and facing with the short leg away from each other. I know, clear as mud and very helpful.

Rich,
agree, could be a hammer- Thor's hammer- maybe one of the Nordic countries.

All just my pure speculation at this time.

I think not the original barrel, as it has no bore diameter designation.

Hammer in a cercle is not for Hammerli ?
Ask for some owner using K31 , barrel hammerli or sig have trade mark

It must be a rebarrel. The barrel seems to be missing the usual Erfurt proof marks in addition to having no bore diameter marking.

It could be a dealer marking as well.