What town did Aleshkin have a shop? Any idea if Kalezky was Austrian(looks to have had a shop in Wien -
http://en.wikipedia.org/wiki/Vienna , Czech. or Russian.
Here's an interesting Russian site view by forced translation:
http://translate.google.com/translate?hl...l%3Den%26sa%3DGDon't select "Czech Republic" as it sends you into a nasty loop.
Select "Russia" on the left side and there's a little info about Matska, I think in the 6th paragraph along with J. Kilby, etc. tube makers. Select "Technicial Conditions" for proofmarks.
Here's the site:
http://www.gunproofmarks.ru/ .
And here's the proofmarks choice:
http://www.gunproofmarks.ru/russia-control.html .
The homepage has a translator.
Kind Regards,
Raimey
rse