Anyone have an OLD Dialight switch catalog? Looking for datasheet

[cvanc]

I have some really nice looking Dialight toggle switches, in factory sealed bags, with a 1985 date code.

They look nice but I can't find the p/n online anywhere - too old.  Does anyone here have a library that goes this far back?

Here's what the bag says:
571-2118-0502-01 (and at the end of the p/n, neatly handwritten on each bag, is the number 4... whatever that means)
8525

I mostly want to know the contact specs, I'm wondering if they are suitable for low level audio.  Thanks!