Hi all. I just found this thread, and hope you don't mind me resurrecting it.
Like you, I am a fan of the Cartiers, Breitlings, Rolexs, Patek Phillippes et al, but I don't have anything like the budget π
So, I've looked elsewhere, and still have a small but interesting collection of classics. I'd like to share them if I may (not physically, just in this message) π
1973 Pulsar P3 Datecommand
When the Pulsar P1 was launched in 1972 it completely changed the way we told the time, as it was the first ever commercially available digital watch, and cost $5 more than a brand new Toyota!
Adding to the capabilities of the Pulsar P1 & P2, the Datecommand was the first completely solid-state watch to also show the date. Its red LED display, stainless steel and retro/futuristic styling make it a great companion to B&O stuff. Mine is still going strong, and is the most accurate watch I have ever owned...< +/- 1 sec per week!
1965 Bulova Accutron Spaceview
Bulova was the pioneer of electronically regulated clocks and watches, using an electronic "tuning fork" that oscillated at a fixed frequency, thus regulating the timepiece. Predating quartz oscillators by years, these watches are a marvel of miniturisation of such a mechanism. Many were in conventional cases, however I like the Spaceview variants as they clearly show that amazing movement.

1972 Seiko 7016 "Monaco"
Another forgotten pioneer of watch movements is Seiko. In 1971 they presented an self-winding chronometer with unique 2 handed subdial for the chronograph hours and minutes that was much ahead of its European contemporaries. Shortly after Seiko, like many others, moved into the production of digital watches, leaving the ground free for Tag, Breitling, Omega etc to produce the quality chronographs. Although sporting a plastic dome rather than a tougher glass, the 7016 chronos, in particular the "Monaco" variants provide a rare chance to own a high quality and attractive self winding chronograph from the early 1970s that is cheap enough to be an everyday watch. Practical and yet interesting - it remains a classic.

Well, I hope I've not bored you all to death, and I hope you'll find these watches as interesting as I do. (But, of course I'd happily give a steel & gold Cartier Santos a home) π