TromboneChat

I found these mouthpieces in a bunch that were donated to my school. There are no markings of any kind on them. One is small shank and one large shank. They are pretty funnel shaped with a small throat, but I have no way to measure them.

Any ideas what they are?

The outside cup shape is like the Olds mouthpieces used to be, but the transition to the shank looks different.

Yup, they certainly look kinda Olds-ish, but not exactly. Maybe homebrew?