Hi
@Kiwi76 here's my 166.0110 from 1971 which runs on a cal. 1002. I really like this watch, it has a cool vibe to it and even has it's original blue Corfam strap which is super comfortable. Despite this I still think the earlier Seamaster Jumbo's you referred to were slightly more reliable, running (from memory) the 500 series caliber which was a real workhorse of a calibre - robust, easy to maintain etc the 1000 series which is in the watch you're looking at getting is considered a slightly more awkward movement to service, as such it does get a bad rap (some say unjustifiably). The rest of the watch you posted looks correct and genuine to my eyes and still retains its Sunburst finish. One thing to perhaps look out for is the movement which looks slightly tired... but it may just be the photos. I guess what I'm saying is maybe wait for the watch you were originally looking for....