Here is an early authentic detailed enamel watch pin. It sports a 6 mm genuine Pearl and is a generous 9.5 grams in weight. It has a "T" bar and "C" clasp that is in great working order.
It is 1 1/2" by 1 1/2" and is in very good condition. My impression is that the Pearl has been replaced recently. It does not detract but I think for honesty sake you need to know.