Double hose regulator metal lapel pin

The Museum was able to score these vintage double hose lapel pins. Well, we don't exactly know what they are......They could be lapel pins, hat pins, earrings, tie tacks, or suggestions accepted. We are really impressed with the attention to detail on these pins. They appear to be US Divers double hose regs. We got these from a going out of business dive shoppe and once these are gone we will not get anymore.