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Here is what I have been able to determine with my very limited noobie knowledge about Straight razors. The vacuum has a full hollow blade and it is 16 mm, therefore a 5/8.

171399

171400
...

Thanks for the info. I found mine in a antique store and will use it to make the leap from DE.

If I am successful then I'll will buy a new straight razor.

I just bought one that I found in an antique store. I too have found little information on them.