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We are wandering into celluloid, it's properties, strengths and weaknesses as the OP's post clearly included this quote;
"AS USUAL, CELLULOID'S NOT VERY DURABLE; to preserve, NEVER open the blade...

Ha! Perhaps, Dave. All archived photos. Lots are afraid of old celluloid, but the things they molded them into would be lost if everyone just ripped them off because they are Cell and for no other...

Therein lies the oft-misunderstood truth. Neil is many men, rolled into one. The Neil Chart as current;

202968

(Forgive me, Neil!)

TBH, the OP did not disclose whether the King Cutter in question is new-production or vintage.
I think new production would have modern plastic scales. Old one could certainly be scaled with...

It seems I read of a company (WR Case?) whose celluloid operation was in a building with a hinged roof.
If it blew, they just simply closed the roof again. :rofl2:

I have many old razors...