Need help identifying my bubbleback

[Peterandre]

Is this a 3696 model? Production year? There is no serial number to be found
Gold filled, stainless steel back
18k solid gold bracelet from early Bubbleback series was added by me after
Thanks guys

[R.W.T.]

Gold filled model sweep seconds is a 2940 should be marked so inside case back. 3 piece smooth bezel 9k and 14k with stainless back is 3696.

[Peterandre]

Thanks a lot

[Peterandre]

Do you have a clue on the year of production

[adam78]

Take off the bracelet, and the case reference and SN may be betweeen the lugs at 12:00 & 6:00.

[Peterandre]

I did. but there is nothing on the lugs
By the way how do I distinguish gold filled and solid 9k or 14k gold?
There is no hallmark on the watch therefore I believed in gold filled
Thanks

[padi56]

Originally Posted by Peterandre

I did. but there is nothing on the lugs
By the way how do I distinguish gold filled and solid 9k or 14k gold?
There is no hallmark on the watch therefore I believed in gold filled
Thanks

If its hallmarked then its gold, no hallmark its gold plated/filled its possible hallmark on inside case back.But if its gold filled it will be around 14 microns thick, on today's gold plating you will be lucky to see 2-4 microns.

[adam78]

You should have a pic of the inner case back. Unless switched with another watch at some point, the case ref. should be engraved there. Of course that won't help elucidating the composition of the rest of the case.

[Peterandre]

Then its gold filled.
If its a 2940 do u have any idea of the time span they had been producing these watches
Thanks
Peter

[adam78]

I would think through the 40s.

[Peterandre]

Thanks a lot Adam,
Happy holidays

[Peterandre]

Sorry to bother u once more
If the case is gold filled, what's the material of crown and bezel then?
Solid gold or also filled?
Thanks, Adam

[adam78]

Not sure....likely the same. The crowns were most likely plated.

[R.W.T.]

The bezel is not removable. It is brass with gold fill like the rest of the case. The crown is possibly filled or solid. It's just a thin cap over the base crown anyway on all of them. It can be peeled off on the early crowns and often wears through.

[adam78]

Yeah, I kind of was thinking gold capped on the crown. I've seen a lot suffering from peeling of the cap.

[Peterandre]

Thanei you guys
I really appreciate your help
Merry Xmas
Peter

[Peterandre]

Finally I bought a 18k gold bubble back to match my golden band
The gold filled tropical now has a Rolex leather band attached

[JohnAndrew]

Originally Posted by Peterandre

Finally I bought a 18k gold bubble back to match my golden band
The gold filled tropical now has a Rolex leather band attached

Those are some beauties!