Earpiece WW2 or Post

[ChannelIsles]

Anyone come across these earpieces before?
Earpieces marked R - 30 - U & HB - 30.

Clip Marked HS - 30 - U

& Jack PL-54

Are they German WW2 or Post War?

Any views welcome.

[Yuri D.]

These look like early US WWII headphones.