In the late 1960ies, Omega launched the caliber series 480, including the caliber Omega 485 described here, which was made in 1970.
It is a classical ladies’ size form movement without any special features.Video on YouTube
The caliber 485 has got a four leg ring balance, which is beared in two KIF Ultraflex shock protection sytems. It beats with contemporary 21600 A/h.
The effective length of the hairspring can only be regulated by the hairspring key, there’s no fine adjustment. Only the beat error rate can be adjusted by a moveable stud. It looks like on the specimen shown here, the balance staff was replaced, because the cock shows no copper coating, unlike the rest of the movement.
The gear bridge is a bit special, in only bears escapement- and fourth wheel. The rest of the wheels are located under a second bridge.
On the dial side, you can see the yoke winding system and some scratchings from former watchmakers. Besides this, there’s nothing special.
In the lab
|dial up||+2 s/d|
|dial down||+7 s/d|
|crown right (12 up)||+40 s/d|
|crown up (3 up)||+4 s/d|
|crown left (6 up)||+15 s/d|
|crown down (9 up)||+27 s/d|
|Size:||4 3/4''' (measured: 12,6 x 15,4mmmm)|
|Number of jewels:||17|
Beryllium bronze anular balance|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Hairspring key|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||3 hole(s)|
|Production period:||1969 - 197x|
Flume: K3 N1 16|