Vintage Certina: may you help me find out a reference/infos?

[HAL 9000]

Hi mates!
I need some help finding out what kind of vintage Certina I've just got from a friend. Here's some pictures (sorry the iPhone crappy quality):

http://i16.photobucket.com/albums/b13/photo_cruiser/ca59d200.jpg

http://i16.photobucket.com/albums/b13/photo_cruiser/878d8994.jpg

The case is gold, the movement is manual winding (still working flawlessly) I thinks it's forty or fifty years old. On the back are engraved these numbers:
5209 124
813073

May you help with some info about it?

Thanks in advance,

Paul

[Ray MacDonald]

Looks to me like 1960s but I'm not a Certina expert. Others may know more.

[jedanzoom]

This one is,according to dr.Ranffts movements archiv page,from mid 1950s.

http://img526.imageshack.us/img526/2019/img2149o.jpg (http://img526.imageshack.us/my.php?image=img2149o.jpg)
http://img402.imageshack.us/img402/5425/img6024l.jpg (http://img402.imageshack.us/my.php?image=img6024l.jpg)