Hi there to all the community. My name is Oscar. I happen to be the proud owner of an Omega Speedmaster Professional 105.012. I have owned the watch for a few years now. Even if the watch was serviced at my local Omega Service Center I never had a chance to look at the inside of the watch. I was considering posting the watch for sale so I had my friendly watchmaker to open the case back so I could take pics. I was slightly surprised when I found that the watch that I believed to be a 105.012-65 has a 105.012-63 stamped on the case back. Since I have never heard of such an early model I was wondering if any of the friendly, knowledgeable and experienced forum members could tell me something, anything about this particular year. Pic of the case back stamp is posted below. Thank you all for your time and patience.