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Before high fives? Tipping their hat I guess? A subtle nod?
Gentlemanly tug job.
“well, and a kind ‘hello’ to you too, good sir!”
Before high fives, in the 60’s it was “Peace✌️”
Go even further back, lifting your helmet’s visor to show your face.
My money’s on enthusiastic handshakes and cheering. Source: old movies.