omegastar
·It wasn't collectors, but Omega itself that used the "Centenary" name beyond 1948. This article from Mondodec has a lot of the history for both models.
http://users.tpg.com.au/mondodec//Omega_Constellation_Gene_Pool.pdf
I know that the smaller Ref. 2499 continued to be advertised in the US as a Centenary until at least 1951. Not as certain about the larger Ref. 2500.
Hope this helps,
gatorcpa
Thank you Gatorcpa
Thanks to all of you for the input, watch is paid, now waiting for delivery.
Mounir