1153s with yachting markings are rarer than the usual 1153 but I don't see that as a reason to add a premium for them. This one has some spotting on the registers, which is pretty common on these. Serial numbers for this dial are typically in the 302xxx-303xxx range; I'd expect something similar for this one.

I see 1153s in the range €1250 to €1750 most frequently, a few coming in under that, some of which are ropey, some are more of a bargain. See quite a few with asking prices above that too, sometimes well above, but they don't seem to move that often. That range for private sales, dealers will obviously add a margin, usually ending up somewhere between the mid-mark of that range and maybe €2500.