My 16 year old son's Premira (Valjoux 7733). Very cool piece indeed, especially for a 1st vintage chrono he bought himself! (Well, a little help from dad 馃槈 )
Bought this a couple of months ago, took maybe 6 weeks to get Viet Nam Post to hand it off to the USPS. The seller was great; for such a pitiful little sale he worked hard to get it to me. Sent it off to rehab and now I've finally got it on my wrist. After wearing a Speedmaster all day this piece is practically weightless.
I'm not sure exactly how old it is. I guess just post WW2 maybe early 1950s. 33mm stainless case - big for this style watch in that time.