I am trying to date and identify the model and movement of this Speedmaster, which was my grandfather's. My apologies for bad photo quality. As best as I can figure, it may be 1969, but I haven't been able to pinpoint the model info, nor have I ever taken the back off. The bracelet is a 1116. I am also trying to determine whether it would be worthwhile having it serviced at the factory. Many thanks.