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SFK is either a mfg. mark like GM or a model like Chevrolet.

Hard to know for sure.

If you continue and shave test frequently then you should have no problem. An abrasive pasted paddle strop is one of the slowest methods because of the low density of abrasive grain per square inch...

I would suggest making use of what you have. My guess is the 2 Sanguine razors are shaving about the same. So...take one of them and work on it with the pasted strops.

1 Perform the TPT to...