I would be thankful for your help as I m not knowledgeable about Speedies...
How can I detect if this was an original Japan Speedy or a converted watch?
THANK YOU FOR YOUR HELP!

 

The reference on the cards is incorrect, should be 3570.4000. 3870.50 is for a standard Speedmaster on leather strap. Is the warranty card stamped by a Japan retailer? Although the serial looks OK someone could have looked for a standard Speedy in serial range and gone and done a dial swap.

 

That reference is one of these:

https://www.omegawatches.com/en-gb/...watch-professional-chronograph-42-mm-38705031

 

Thank you exactly these were my concerns. I wasn’t sure about the correct ref. Number. I did ask the seller for the retailer and currently wait for his answer. Which serial ranges are the Japanese racing dial watches?

 

I don't think a dedicated serial range would have been set aside for the JR but the mod in this thread is within the range of JR serials I've seen with correct warranty cards. With these watches you need a correct and stamped warranty card to have some confidence.

 

If you have the serial number from the watch (not just the one on the card) you can email Omega customer service in your country and ask them to see what reference the watch is. However, if the serial number on the watch matches the serial number on the card, chances are it's a dial swap.

 

The paperwork suggests it’s a modded watch.

 

This watch sold on eBay recently and was correctly described by the eBay seller. https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/254326764635
Is this auction house bogus or just not knowledgeable?

 

It amazes me how off some of the auction companies are from ensuring authenticity or correctly describing condition or way off estimates.

 

This is a mod. Referebce is wrong and serial nr. is too high

 

You read the thread where other people said that right?

 

Yes i did and compared the serial to my JR serial

 

Other than your own watch, what other information do you rely on to state that 77133 is too high because I've seen a JR from a very reputable dealer with a higher serial?

 

Only my own whatch that differs about 5000 in serial number

 

I've seen confirmed Japan from 77109xxx to 77134xxx

 

FWIW, this watch appears to be at auction at Sterling Vault on 28th November. Careful bidding, everyone...

https://auctions.sterlingvault.co.u...-details/d7bda385-cd79-4432-8911-ab0600d593d0

 

WhTs the issue with b&p?

 

I'm pretty sure the auction one is the same as the one at the top of this thread:




... which is the wrong reference for the Japan Racing dial. And the box in question is a regular red Omega box, not the wooden box that should be provided ...

eg the Davidoffs' one on http://www.db1983.com/the-collection/omega-speedmaster-357040-japan-racing-20044

 

@ewand is correct, the 3870.50 was the standard sapphire Moonwatch on a black leather strap. A true Japan Racing is a 3570.40, and should come with a warranty card from a Japanese retailer.

 

Serial number: 77133762
Article ref: 38705031