Replacement case backs do not have this marking, at least as they are shown on the Omega Extranet. This case reference 055ST1750043 is used on 36 different models according to the Extranet, and of course most are not Golf models.
Keep in mind with all the white, green, panda, blue, etc., dials out there, many of these are still available from Omega (including the dial on this one) so it's always possible someone has swapped a dial, and the watch you are looking at is not an original of whatever version you think it might be.
Now going to the eBay auction and seeing the full serial number, this watch is originally a green dial watch, and the model is 38117026.
Cheers, Al
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