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Nice one . Is it fine . Is it hard .
15 x 4 sm size isn it , it looks like a thick coti layer . Congrats .

The size must be 15 x 3.8 or 4 sm or 14 x3.5 sm .In US standart is 6 x 1.5 inch . I have the same coticule and it looks the same under the oil dirt . They always used them ,with oil in the past .

I would say coti also , as the layers arent equal in thickness - in the left end the BBW layer is thicker , and the white is smaler .
i bett on cotiule .