It's strange for sure.

It's mere guesswork just seeing photos, but it looks like the ring is the non-Catalin non-yellowing stuff that Lawrie used back in the day, or perhaps Catalin that's had a ton of wear.

The bush looks like Galalith, which most pipers incorrectly call Casein.

(Casein is milk protein in raw form. Galalith is a plastic made from Casein, introduced in 1914, which was very popular in the 1930s and drastically declined in popularity during and after WWII.)