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You missed the price of the setting lever!! 120 UKP fora service is a great deal, and it is indeed a lovely watch with what I'm assuming is an 18k case....But this is a perfect example of the point I'm trying to make. Is it worth 900 pounds? Yes probably if it's gold ? Would someone go to 1200 UKP (1300+ USD )for a simple uncomplicated watch of this nature with no particular historical or military provenance from a non commercial seller? That's where I'm not so sure...I'm not meaning to dis your sale in any way and I sincerely hope you get what you want for it, but to hobby collectors like me, this is a significant step over my personal comfort zone. The watch owes you 720 or so, I can certainly see a small profit there.. but a 50% markup on your outlay might be a bit ambitious.
Your watch box is very cool btw.