A couple of weeks ago I ran across a very nice 16610- the earliest model- an R serial. These came out in 1988 around the time the 16800 was ending- the last of the 16800s had an earlier R serial. Also, the 168000 was in production during that time with the new 904L case. But whereas the 168000 had the 3035 movement, same as the 16800, the 16610 had the new 3135 movement and the 904L steel case. This watch was priced fairly and in very nice condition. So I picked it up and have been very happy with it. This watch does have an aftermarket bezel insert- note the smaller pearl, but sooner or later I'll get around to putting a gen in there. I've even got a nice boxy 4 gen insert in my 16800 matte dial franken that I could use, but I'd rather try to find the earlier more triangular 4 insert that came on those subs from that period- Rolex used the same parts for the 16800/168000 and 16610 during the 1987-88 period- insert, bezel, dial, hands, crown and tube. So many parts on those three models of subs are interchangeable, it's amazing. This watch has the original dial, hands, crystal, the tall crown and original tube. The one thing that surprised me was how the lugs are not tall- they're very similar to the 16800s that I own. Not at all like the Euromariner 16610 that I have. The bracelet is the 93150 with 501 B end pieces and is marked S 6 on the clasp. I don't know if it's a service replacement, but it is in mint condition. But the whole watch is in mint condition with the exception of the aftermarket insert. One nice thing is the original date wheel with the open 6s and 9s- these were on the early 16610s for a few years and then they switched to the current type of DW with the closed 6s and 9s. Here's a wrist shot w/ todays date The tritium is getting a nice patina on the dial and the hands are a shade lighter. There is a feint glow at 4 am when I go to the bathroom! By the way, SN is R698,xxx which is the earliest I've seen on a 16610. Hope you enjoy the pics.