Sekonda Ladies watch - is it gold plated?

[Edifred]

I have just finished servicing this tiny watch and am amazed at the amplitude (340 degrees - too much?) and accuracy (20s/d 0.0ms). I have moved onto the case whioch has polished up nicely. However I am unsure if the case is gold plated or not. The weight does not suggest solid gold but I cannot see any base metal wearing through. The markings on the gold coloured case look like △u10' but cannot find out what that means.

I believe the movement is known as a Zaria and has the number 1509B.1.

I'm guessing it is 1960s / 1970s. Anyone able to shed any light on whether this is gold plated and also age of the watch?

Edited July 27, 2024 by Edifred
spelling

[AndyGSi]

△u10 or AU10 means 10 Micron Gold Plated

Edit

The movement is a 1509B.1 which wasn't made until 1980

https://17jewels.info/movements/z/zaria/zaria-1509/

https://ranfft.org/caliber/10762-Zaria-1509B1

Edited July 27, 2024 by AndyGSi

[RichardHarris123]

AU, atomic symbol for gold.  The 10 I think is 10 microns, so gold plated. 

Edited July 27, 2024 by RichardHarris123

[tomh207]

I suspect it is 10micron gold plated.

 

Tom

[rehajm]

The wife approves. One look at the face and said it would be beautiful with a gold case…

[oldhippy]

It is plate so be careful when polishing as you could rub the plate off. They were about in the 70's I can remember repairing this sort of Russian crap. I think the movement is a  raketa which means Rocket. I t has a little shim under the balance cock.