Sounds to me like a 1941 production of the tula, Nagant m95, revolver. That specific stamp was used on the nagant revolver from 1928-1943 a seven shot revolver with a gas seal system that allows it to be suppressed. It shoots the 7.62x38R aka 7.62nagant , a very interesting piece none the less.
A U with an arrow through it on a diamond ring does not have a significant meaning. It is most likely an engraving or marking of some kind.
a needle
The non-military variants will be marked "Baikal-442" or "IJ70". The military models will always be chambered in the 9x18 Makarov cartridge (whereas the IJ70 was also available in 9x17/.380 ACP), and they will have the Izhevsk arsenal marking (arrow inside of a triangle). Pistols made in East Germany (which, by the way, are the most highly sought after of the Makarov pistols) will have their markings in German, Chinese pistols will have Chinese markings (and these are also manufactured through casting, rather than forging). The Bulgarian pistols will have Cyrillic markings, as well, but they won't have the Izhevsk arsenal marking (arrow inside of a triangle).
It's the marking of the arsenal which manufactured it. In this case, it would be the Tula Arsenal.
The gun was made sometime between 1943 and 1948.
Usually, "Go this way."
Click on the arrow leading inside how?!?!?
A white line with a curved arrow pointing the way you must go.
If you see a sign that has a U, with the arrow through the U, inside a ring, it means No U-Turn. This means that you should not change the direction you are traveling at that intersection.
If there is a + and - at the ends of the arrow as well, it's a DC supply pictogram (8volt) The U with the arrow is the hallmark for Uncas, it is a jeweler established in 1911. ADDED:: the 8 is the size
Alkaline Trio
Inuit of Baffin (historic) Bow and Arrow,Spears, Lances and harpoons. Modern: rifles of various caliber, shotguns and Harpoons.