Watches

If a person wears a high end mechanical one day then a casio f91w another there is a high probability he/she has the big.

Nobody mentioned Longines 🥴

Anything with a moonphase or open-heart design.

Merely wearing a watch that is not a smart watch tells me that you are into watches to a certain extent. I have seen people be passionate about any type or price range.

Studio Underd0g

Grand Seiko

I’ve had my Hamilton khaki field for about 2 years and on 4 occasions other watch guys noticed it and started up a conversation about watches

Hamilton or seiko automatics
Grand seiko Any casio on a nato strap

Journe. I don’t like them but when I see someone wearing one it’s a pretty good signal that they are avid collectors.

Any A. Lange & Son watch, scratch that not watch, timepiece

Those are serious timepieces and aren't for people who are not into watches

Oris, Nomos, Grand Seiko…

A Ball, or a Breitling would remove all doubt.

Lange

NOMOS

Obscure seikos

I would have to say anyone I see wearing a Micro Brand.

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Think, NTH, Scurfa, Aevig, Helm, etc... those are brands that get absolutely Zero mainstream advertising, so there is a very good chance they are a watch nerd.

Seiko Red Alpinist

Grand Seiko

I have never seen this yet, but if they're wearing the iconic seagull 1963

Seiko

anOrdain Model 1, one of the Fumé ones

Vostok....although super cheap, it's one of those IYKYK watches.

Glaschutte Original, is also a good indicator you're a watch guy.

Anything custom made or modded.

Hamilton, Marathon, Doxa, Sinn, Nomos, to name a few.

Pretty much anything that isn't a smartwatch, a G-shock, or a basic Timex. That's what I see on 90% of wrists of people who are actually wearing a watch.

Or on a wealthier person, anything that's not a Rolex or Omega Seamaster.