When unsure about a watch, one of the conditions that need to be satisfied before I buy it would be the possibility of retrieving all my money back should the watch not be suitable. The 5131R fell into this category. Similarly, I have a left a deposit on a RW Smith Series 2 but am unsure about its 13.5mm height. Nevertheless, I do know should this watch be deemed unsuitable, it will almost definitely return my money should I decide to sell it. This is why I am unable to buy say a Lange or a Vacheron unless I am 100% sure it will be a keeper. For most of us, with the number of lovely watches in the market, it is near impossible to say how long we would keep a particular watch. I may be very wrong here but for me personally my 5940G and 7200R are likely to stand the test of time. I hope so anyway. I cannot say the same about the H Moser I just purchased or the RW Smith I have on order. They are beautiful watches in their own right but they have to feel right for me in terms of weight, diameter, lugs curvature, height, etc. Fussy old pot aren't I?!