5 digit serial number is strange. See sellers comments below http://pages.ebay.com/link/?nav=item.view&alt=web&id=281860060383&globalID=EBAY-USPurchases made through these links may earn this site a commission from the eBay Partner Network Edit: Seller lists the dial as original but redone. Regarding the movement, Seller insists the movement is a very early 321 movement, but not labeled 321, and the serial number is correct. He maintains that Omega serial numbers were haphazard in the 1940's.
Yeap, the Lemania serials on these are typically 5 digits so thats most likely what it is. Seller gets points for trying on the "Omega was haphazard in the 40s" statement though.