I think, all punches as it should be. Vladimirov is a retailer. Punch of the real maker is situated below (deep) the Vladimirov punch. Therefore defects are around the letters "м”, “i” and "р”.
Nice doing Dad, thanks. Troepolskaja recognizes МПЗ (#19304), but not 3AB. What does it stand for. 3 for "Завод" but the rest. AB?
Information about Frolov and Ushatov is correct.
AG2012 wrote:The assayer MK was Mihail Karinsky PL 1165 and 1166.
In office 1825 - 1838.