If it is small (32 mm in diameter) than it is mostlikely the reference 3439 with the brilliant (!) auto caliber 27-460.
The mayority of the 50ies - 60ies Calatravas were manual, so it makes it quite likely to be a 3439.
If you post some pictures we could tell you, or simply let the watch open at a jeweller / watchmaker and see.
Regarding value: can match the depicted current 5196 Calatrava in an auction.
But that is a slightly optimistic guess.
Regards
Moritz