OEM alloys parts number

[doonbeg]

Hi, Just joined the forum. A while back I bought some 17" style 57 alloys in the used market for my E53 3.0d Spt intended for winter use. They were a bargain at £150 for the set but I wanted to check that they were OEM. There's a 7 digit parts number stamped on the back 6762330-14. There is also a 'BMW' stamp and a 'United States' stamp. Seems a bit odd because the parts number doesn't seem to match the BMW catalogue. However the number does show up here and there on-line. Is this a US parts number or is it otherwise possible that 2 part numbers exist for the same OEM wheel? or are they replicas? thanks for your help!!