Help!! What is this box?

Help!! What is this box?

Thanks for posting, but its not.
The correct answer was posted and photos linked.

Demonic said
Red button on the other side? It's the seat belt interlock relay and override. Find the yellow from the key & run it to the starter solenoid, or just bypass the contacts.

townsend said
Interlock system was used on 75 models up to October 14, 1974. Check your build date.

H22A4 said
Earlier this month the same question was asked…..

1975 Plymouth duster brake relay question?

From the diagram