QUAERITUR: black and purple reversible stole

From a seminarian:

I am a seminarian, soon to be ordained a deacon (Deo volente!). A
priest recently was getting rid of some old stoles, and offered that I
could take any that I would like. I took one that I had never seen
before – a black and purple reversible stole. Do you know of any
rite(s) this might have been used for? I’m not sure, but it looks like
it dates from the 1950’s or early 1960’s.

Thanks for all you do, and please pray for me!

You are welcome.

I suspect that this stole was used on Good Friday, which in the traditional way of doing things, the colors of vestments changed.

You will likewise find stoles that are white and purple, reversible, which are useful for baptism in the old rite.  The color of stole changes.