Lots of talk about watches going up in value, but when you have a good look around there are some great sleeper watches to be had for reasonable money if you avoid the likes of Watchfinder/Chrono24.
I think the MKII Speedmaster ST145:014 is in the dark side of the moon, these seem to struggle when coming up on SC at around £1700'ish, in yet it has the same 861 calibre as the Speedmaster Professional from the era and original dial/hands will have a lovely patina. Apparently it was destined to take over the Speedy pro at NASA but the testing schedule was too tight so they stuck with the pro, its a big watch with wrist presence that should suit today's buyers but it struggles.
What watches are under the radar to you?