I came across this pen on the internet. Any expert out there can tell the meaning of the numbers, the letter and the trade mark of the engraving on this nib. What I got is, the pen is made in Bulgaria in 1963. 12.8 cm long (should / could be bakelite barrel) 100% authentic The marking: something like a big rectangular "G" 1, 22 7M2 I just wondering which company produced this, or government owned commune? Many thanks.