Era
Modern watches that collectors already buy used. The Prospex Turtle came back in 2016, the Seiko 5 Sports range was relaunched in 2019, and Casio's GA-2100 arrived the same year. The Cocktail Time and the AE-1200 are here too.
5 references we cover.

Seiko · Prospex Diver
Diveref SRP777
$750–$875 typical ask
6 on eBay

Seiko · Presage Cocktail Time
Dressref SRPB43
$440–$650 typical ask
8 on eBay

Seiko · Seiko 5 Sports
Fieldref SRPD55
$280–$390 typical ask
60 on eBay

Casio · G-Shock Analog-Digital
G-Shockref GA-2100-1A1
$120–$180 typical ask
118 on eBay

Casio · Casio Classic Digital
Digitalref AE-1200WH-1A
$35–$55 typical ask
86 on eBay