This buckle by “ACE” is graded 0900-in-rectangle, but matches the same marking style used on a similar one (current listing) graded 925. [Most of these buckles are being described as Sterling with 18K Gold, but there are no applied grading marks for the yellow metal applications. This looks suspiciously like they mean gold wash rather than solid. Any ideas?] Could ACE have been working in an earlier era of coin before switching to a more common higher standard. Or are there still bucklers operating in coin?