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If I am not mistaken if the scales had a grain and were synthetic the grain would be identical from one side to the other. So they are probably ivory as the pin test would indicate.... or bone of...

Good that you are using tape IMO. They might be genuine ivory. Do they have a sort of random grain that you may have to turn the scales in light to see ? You could do the hot pin test to check that...

Puma made great razors and they made them, they weren't sourced out until the very end of the company. If you want to avoid wear on the spine, particularly on the lower grits 1 layer of electrical...