The earliest watch I have seen 11 endlinks on dated from 1961. I am sure they were produced prior to this. 14 end links are relatively rare, I have only seen 1 pair, and it was on a Dennison case. This watch dated from 1952.
I think either will be period correct. However, the fitment issues may be down to endlink's which have bent at some point in their life, and not necessarily because it was made like that.
I don't have any data on the original bracelet of the 2900.