The movement used in these is the workhorse of Omega Autos, the fabulous 752 and its variants (752 is day/date with quick date change, they also used the date only version and the wind up version).
Up to this time, Omegas where conservative, very stylish and practical. Popular with Doctors and accountants. The Dynamic was a clear shift down the sports path. They where distinctive, water resistant and tough.
They came with a strap or a bracelet. I don’t think the original straps were leather. I’m going on memory from way back and I can’t find any info on this. I remember some more
propaganda that said it was some special material that they developed. Anyway, leather is not too good for watches that are all purpose. And the strap turned out to be their weak spot. Standard straps would not fit the Dynamic, so it had to be original, and boy, when Omega have got you by the nuts they know how to squeeze hard. And when you have a heavy stainless steel watch with a strap that narrows to 14mm, it is just too narrow at the buckle to last.
So, the first of these I brought was all original with a strap but only date, no day. The dial seemed a little faded.
Another came along, this one I should not have brought. Repainted dial (a bit dark), non original glass and non original strap.
Another came along. A 752 auto (day and date) this one in poor condition but all original with a bracelet. This was a perfect restoration job and, if I say so myself, I did a pretty good job of it. This is the only one I have now, I sold the other two, but I have added a matching ladies version. This is the only ladies watch that I have in my collection
As I said earlier, the Dynamics, as an Omega line, have resurfaced in the years that followed but they were like the Ford Mustang; they keep on re-releasing versions of it but it’s the original that has that something special that made the name a legend.