Lots of brands have their own system. Omega Seamasters have used the round holes in a circular pattern for a long time...Panerai have their own system...Breitling have their own system, etc.. It's pretty common for brands to have their own case back tool designs. BTW Rolex is probably the worst design out there, as the fine teeth on the case backs are often stripped (in particular on precious metal cases), and in general are not as securely mated to the case back tools as other designs in my experience.
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