Used Horn Stop Mute (Manufacturer Unknown)

I am completely retiring from playing the French horn, which I have played as an amateur for many years, so I am offering the accessories I used.

This is a stopping mute for the French horn.

I accidentally peeled off a sticker that was attached, so I don't know the manufacturer. It was probably Tom Crown, but since I'm not sure, I'm offering it at a bargain price.
There is some rust and minor scratches overall, but I believe it functions perfectly as a mute.

This is a used item that I have used for a long time, so I would like someone who understands this to use it. Thank you.