Omega Speedmaster MK IV

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looking at these two on Ebay and wondered if anyone could advise.

The first is in Mexico. Wondered about the serial number type. The 3 numeral is different to one I know is legit ( Flat top ) . I imagine different stamps may have been used ? Just wanted to see if anyone could shed any light on this.
Also the case back stamps are different to others I have seen.

https://www.ebay.com.au/itm/235005046844?hash=item36b764703c:g:uIkAAOSwUCRkSIRS


The second watch I was looking at has been serviced by omega Switzerland apparently.Parts of its case look to be be polished and the edged dont look sharp? Any advise would be appreciated

https://www.ebay.com.au/itm/134052751754?hash=item1f362aa98a:g:KLUAAOSwkTtiLhpd&autorefresh=true
Edited:
 
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If you post some photos relating to your questions you'll get more responses.

This also helps retain a record of findings for future generations and spares the cautious members from having to click on embedded links.