Help ID Listening Tubes, please....

[outune]

Recently got these hearing tubes at a local estate auction-- There were only two machines at the auction-- An Edison Home model B (I bought) and a Columbia BC (which I should have bought!).
These listening tubes resemble Columbia ear pieces, but have metal elbows-- The "Y" piece is gutta percha.. The ear pieces appear to be also. The rubber is still fairly flexible.
Any definitive thoughts or guesses?
Thanks Much!
Brad Abell

[Stephen_Madara]

I think Shawn would be the most knowledgeable about these

[outune]

Thanks Steve- I already checked with Shawn-- He wasn't totally sure --figuring the metal made them later than the all gutta percha. The tubing still has quite a bit of flexibility.
I'm hoping someone will have "seen it in the catalog" and can make a positive ID


Brad Abell