I've pretty much concluded that the watch I'm looking for doesn't exist, but I figured I'd throw it out anyway…
I'm looking for a thin, light, clean mechanical watch (manual or automatic, although manual would be ideal) with a day/date display:
- Case Thickness: 4.5-8.5mm
- Diameter: 34-38mm
- Price Limit: $300
- Condition: New or used. If there's some 30-year-old watch that pops up on ebay from time to time and fits my needs, I'm all over it.
For reference, this continues to be my favorite mechanical watch: A 1970s Cornavin/Luch ultra-thin. If it just had day/date, it would be absolutely perfect. It's about 5mm thick, about 37mm in diameter, and weighs pretty much nothing.
There are some very nice thin and light manuals (although seemingly very few made after the 1980s), and there are plenty of affordable day/date watches, but they all seem to be quite thick and heavy. For instance, this Seiko SNK809K looks pretty nice, but at 13mm, that's quite a large hunk of metal to strap to my arm.
I'm aware that this may be an impossible request, as the day/date may simply necessitate too much complication for a thin watch (that doesn't cost $20,000), but it seems like there has to be something like this out there. The Seiko I referenced above could probably have shaved off a couple inches if they'd simply made it manual-winding, and it's not very expensive.