This is quite interesting. My MK012s appear to be Russian according to most every picture from the link you posted. However, there are a couple of things that seem more Chinese:
1.) Mine say A.S.M. at the bottom as do the Chinese mics on the right
2.) Mine say Oktava like the Chinese mics, rather than the cryllic v which looks like a B. (However mine have MK-012-01 (no A after the 012) like the Russian mics in the photos.)
3.) I bought mine back in 2003, but they do not have serial numbers. I suppose they could have been manufactured before 2002 and therefore don't have serial numbers, but I bought 'em late in 2003. Actually, it could've even been early 2004.
4.) No documentation, (manual or response curve with hand written info)
Everything else is very Russian. White screws, silver sputtered contact pins, bonding areas have dimples for effective contact, metal mic clips, -10dB pads, and a case like the one shown on the Russian side. All the photos of the various mic parts on the Russian model definitely match mine too.
I can't remember how much I paid for mine...not too much though. Probably about $70 each.