MO marked TT33

can you explain for us not inclined on the subject please?
MO stands for "Ministerstvo Oboroni". Firearms with MO markings most likely were issued to VOXR armed guards. Something like money transfers, guards at factories and plants etc. It's just firearms with uncommon markings.
 
There are many theories on MO subject.
Some say its stands for Ministerstvo Oborony, however this ministry was established in 1955 and dates dont lign up with its creation and markings on MO firearms.
Some say MO stands for Modernisirovanoe Oruzshie, which translates from Russian as modernized weapon and the date of modernization.
So pick your story as no proof or disproof exists for what exactly it means.

can you explain for us not inclined on the subject please?
 
There are known MO and XO markings on soviet surplus arms. One of the theories says O stands for obrabotka or treatment, so it could be a mechanical or M, or may be chemical or X. Just a theory. Hopefully soon we will know what it is. MO was noted on TT's, Nagant revolvers, 91/30's...XO was noted on 91/30 so far.
 
MO on Soviet firearms also means that they were taken into inventory by Polish Police. They would mark all guns in their inventory. MO "Milicja Obywatelska" . Guns that could bear MO from Polish service are Mosin Snipers, Brno 47 rifles with Carl Zeis Jena scopes 4x and 6x, M 44, 91/30, Wz.29, TT 33, P 64 pistols plus PPS 43 and PPSZ sub machine guns.

Some TT 33 will have PKO "Polska Kasa Oszczednosci" National Credit Union
SOK "Sluzba Ochrony Koleji" Railroad Police
SP "Straz Przemyslowa" Industrial Security
 
Martin, are Polish MO markings accompanied by two-digit year? Do you have pictures of Polish MO markings? I guess MO in question has nothing to do with Polish MO but still very interesting topic.
 
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