My latest vintage - Movement Unicorn

[DrLindaPhD]

I posted pics of my new addition. I'll include one front shot here. I took off the back and found that the movement says UNICORN 15 jeweles. It also says

"For Rolex" and "Keystone" and "14k" and has a strange reference number appearing in a "V" shape.

the numbers on the left going down to the V are:

5585 and then going UP the V it says O68

That can't be one reference number because it would be a 7 digit number and they were issued in the 70s (5 million series).

Yet, 5585 is very early.

From the Unicorn name it appears this would date this to around the 20s. However there are only two jewelers marks - the one from my recent servicing which was on 12/12 and it says 1212 and another one which I can't read.

I have heard the name KEYSTONE was a Canadian manufacturer.

Any ideas about that reference number? You can snag the photo and enlarge it and read it for yourself. I'm confused.

And, yes, this MINT watch has the original dial and original blue steel hands. I love it.

I timed it for the last 3 days and it is losing 30 minutes a day so back to the watchmaster tomorrow. I also just found a watchstrap called a "fold over" which is the type you need for these hinged lugs. I'm so glad I found one as I tried to "lace through" a suede strap but now can't get the case open so I had to take it off.