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Bob,

It is slightly larger than a 6/8, so a 13/16. And this is what the stamp looks like:

241186

I would double check your razor to see if it might be a rescaled gold dollar. ;)

Bob,

I have a Rugra in 6/8 and it is impeccable! One of the thinnest ground razors in my collection and a very fine shaver.

I am sure you will enjoy the shave. Nicely done!

Here's mine,