Having sorted through them they're all in the high 770's / 780's with a few exceptions like this double marked casing and a couple that were hovering around 820:
I considered just asking the seller what they are but I got them mixed in with a 100 lot of D9K's at an appalling 70:30 ratio so I think he might have been trying to cut the larger lots of Ge's with these non-descript Si blanks; he doesn't have anything like these listed as anything else in the shop (like I say, his D9D's have bands). I queried it immediately at the time and he sent me another 50 D9K's without question - So it's a bit of an awkward subject to approach again!
Interesting stuff anyway. For now they shall be called 'Mystery Russians'
though they are very much Si diodes, at least the ones I have.
I'm tempted to try some of the D9D's you linked to see how they compare - should be 330 / 340 - I've sent the seller a message to see what he says.
I certainly haven't come across the markings before though.
Thanks for the help.
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