The insides of most of the watches I've gotten at the swap meet look like the one below . . . made mostly with plastic components.
But a few are a bit different. This inexpensive-looking Armitron watch for example. The back plate was held in place by four screws, unusual, and easy to remove.
And the inside contained mostly metal and not plastic components. Surprising yah. Also, the rubber gasket was thick and not flimsy, and it held together after I pried the watch open.
This plain-looking Timex surprised me too.
It had a huge battery in the middle of the watch with the watch components all nestled surrounding it.
I bought this watch at the swap meet this past weekend. I've come to believe that the best made watches are Swiss made, and I wanted one. So when the seller said, "It's $10 because it needs a battery.", I jumped on it.
It's a quartz watch so the parts are pretty minimal and don't look especially outstanding to me, but it does say "SWISS" on the plate. The battery is bigger than any of the ones that are in the cheap batch of batteries that I got from Amazon, so I need to get one.
I also got this Seiko watch this past weekend. It's a wind-up watch and the band is broken. It was only $1. It actually worked for a few hours after I wound it.