So likely 1950s vintage?

I noticed some of my rotary valve corks are well worn. Would any cork/rubber stop work or is there a measurement I need to take to get the right size and/or type?

It is a BBb

The bell has a diameter of 17 11/16" on the outside edges.
The height from the base to the top of the bell is ~41"

Attached is a photo of the tuba.

Thanks,

I acquired a used Meinl-Weston over 30 years ago. At the time I was studying with Sam Green and he had a college student that was looking to upgrade so I got a good deal. Only markings I have found so far are on the bell : W. Meinl-Weston Band Instruments No 1070 lead pipe: Made in Germany See ...