It closely resembles the "pentacles" found in illustrated versions of the Key of Solomon, a Kabbalistic (Jewish-occult) textbook.
Illustrations here. The accompanying text also states that pentacles made into medals are most effective when the "planet" they are associated with is matched with the correct metal; for tin, that would be Jupiter. Your piece most closely resembles two of the Jupiter pentacles.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis