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They sell newly forged razors, and they also sell razors made from their stock of old forged blanks.

I e-mailed Rasurpur and asked. Just got the reply...Martin said:
It is hard to say but at least 50-70 years with the Festonné.

Hmmmm, I'm in that same range myself.

I wish I knew about how old these blades are.

Here is the box label from Rasurpur:

36308

Yep, I bought the "Fox and Rooster" version. Mine is 7/8 at the toe end and 6/8 at the heel. Shaves great. Looks great.

I was aware of the 6/8 vs 7/8 confusion before I bought it, but your...