I found this very interesting and very good vintage watch.
The name of watch is AURORA ancre 17 jewels.
I didnt find anything under balance and didnt find anything about movement on bifun.
Hmmm ... but i found an interesting page about that letters from picture 1 (Codes for Swiss Movements [Archive] - National Association of Watch and Clock Collectors Message Board).
Can anybody tell me what kind of movement is this and year?