There are a few vintage drum forums you could browse.
Mine is 8 lug....and is a KILLER drum. How can I emphasise this?

I'm guessing (purely guessing) a ten lugger might be more rare.
I would go on playing condition and sound though. It may be that an 8 lug snare is easier to use than a 10.
Also depth.
Mine is 5" I think, which is shallow, but the snare still slays everyone who records it.
6.5" is more unusual and I think would be VERY collectable!
The 6.5" is the ultimate. Anything 5" or 5.5" would be great for recording. I would say think hard before buying anything shallower.
Also, please don't get hung up on the museum, collector side of things.
These drums are highly regarded by studio drummers and record producers. Don't walk away because it doesn't have original snare wires, is a bit dirty, or has a few scratches and small dents. These factors might effect the price you pay, but ultimately it's the sound that's going to pay you back. A savings account or stock market shares have a better return than vintage drums.