they are often given out as advertisements. .. ... .Some are very rare and worth a lot. They are from venerable companies now out of existence, so the chips are obsolete. .. .... The current ones are worth little. From some companies, you just have to ask for some.

This must be my most valuable one:

Some of my others:

Robert
.
.
Barry Sullivan at faro table in "Texas Lady" (1955).
http://www.antiquegamblingchips.com/StillsB_OthMaleAcs.htm