Agreeing with HomeGuardDan... I've searched thoroughly through the Albert book on American uniform buttons (from the Revolution through the 1970s), and there is no match-up for your button in that book. So, like Dan, I suspect your button is a Merchant-Navy or shipping-line button.
I should mention, your button's Superior Quality backmark is written in "plain block" lettering, which indicates it does not date any earlier than the very-late 1800s and is most probably from sometime in the 20th Century.