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The one in the picture is a 6/8, but the scales are very light on that on as well -- actually, the whole razor is very light, it weighs less than some of my 4/8 razors. It's got a very stiff wedge...

I've got a couple of them. The spine was originally soldered or pressed on. It should be solidly affixed - you shouldn't be able to take it off.

AFAIK they're just a particular style of...