I've seen a number of these posts here and figured I'd try. I have been looking for an original authentic 1977 speedy. Does this one for the bill:

http://m.ebay.com/itm/Omega-SpeedMa...%3Ac09b17341570a2a405cbecb5ffffd7d4%7Ciid%3A1Purchases made through these links may earn this site a commission from the eBay Partner Network

 

Looks legit, but factor in that it does not come with a bracelet

 

Maybe. It looks ok but is missing a caseback photo. Ask the seller to confirm the caseback reference. You want to be sure it's a 145.022-76 or 78.