Checking photos of Komz 6x24 binoculars of the 1960s and 70s I note that on the left prism-plate they are invariably marked [and please excuse my inability to insert Cyrillic characters here]: bnw6x24 (without any spaces between the characters).
I'm being offered a pair marked, bwu2 6x24 (with a big gap between the two groups of characters). Below is a seven-digit serial-number which if genuine means that they were made in 1975.
Their hard case is crescent-shaped, of heavily-dimpled leather (from the looks of it) and embossed 'Made in USSR'.
Please forgive also my inability to supply photos; but based on the above is there something suspicious about these binos being 'bwu2' rather than the usual 'bnw'?