and after losing sing 'a bit of hair' myself, have just enough experience to suggest graciously conceding the obvious here ...
A straight lugs movement is a bit different then the twisted but i've already commented a 24.9* mill exists for the 105.003-65 so why not an early 25 mill ? Anyway, pictures would help.
Its not about the serial number.. my 105.003 has a 260... number. But i would love to see another of these dials for ref
What is different between the straight and twisted lug cased movements? To my knowledge the 321s are identical throughout the production batches for Omega?