Hello
I was chasing this watch for approximately 3 months and finally got one in June; here is what I learned during this time (please excuse my English; I am not a native speaker).
Overall, this reference is not too difficult to find, the "standard" places in the internet have already been mentioned. The more time you invest, the more watches you will find on (virtual) market places, at auctioneers etc. I realized that the 3592.50 is also quite popular in Japan and I was very close in purchasing a watch from there (but was too slow and somebody else picked it). Rakuten and Yahoo Auctions (.jp) typically have several offers and it seems quite easy to get these items using buyee.jp or zenmarket etc.
The price of this particular watch seems quite reasonable to me. Again, I watched the market for about 3 months and compared roughly 30-40 models that were offered during that time. There are obviously several points that need to be taken in consideration and it is sometimes difficult to get all the information you would like to have. Furthermore, what some sellers describe as "mint" is simply called "good" or "used" by others.... Pictures with low resolution are one of the major issues in my view. Having that said, some of the ultra-high resolution pictures show you tiny scratches that are basically invisible by eye (without magnification). I decided that box (mostly degraded) and papers are not too important for me but I got an Omega "Extract from the archives" for my watch. If you are a collector, you may have a different view on these aspects. I ended up buying a watch in Europe from a seller that I could meet in person which made me feel more comfortable (of course, I am not an expert at all and this did not exclude that I get scammed...).
Regarding the price: in general, watches in "good" condition until 4K are typically sold within few days. It is also very clear to me that the price for the 3592.50 (probably as with most Speedmaster references) has significantly increased over the last years. Only 5 years ago, it was apparently quite simple to find this reference for 3K or less while now most of these watches are offered for 4K or more with a clear trend towards 5K or even higher. Therefore, I agree with the comment of Leon that in the near future, you would love to get it for the price that is now on the table.
Good luck!
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