Coin Slot

Coin Slot Magazine - #044 - 1978 - September [International Arcade Museum]
It isn't easy to tell a Watling OPERATOR BELL of 1920 apart
from a Mills. The only concession Watling made to Mills when they
copied their Bell machine inside and out (although Watling did do
some mechanical improvement work on the reels) was cut the
Mills "Owl" logo out of the foundry pattern. You can see the
Watling revision as a black dot over the payout cup.
It wasn't
until the late twenties that Watling followed its own design course
in Bell machines.
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