Davel 21 Window?

[markymarkuk]

Does anyone know what the purpose of the small clear window under the push arm is used for? Looking from the outside and from the inside I really am puzzled as to its purpose? Anyone here know? Thank you!

[kentdun]

I think is to verify you played with a coin and nota slug

[markymarkuk]

That was my first thought, but there's nothing inside that holds the played coin behind that window. The coin just drops immediately into the bottom of the case.
Any other suggestions?

[radiorich123]

There is a broken part or missing part in the coin hold meck.