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Pretty sure those are Rosewood, not Bamboo. They're also look to be the original non-fazor LCD-2's due to the headband/wood connectors.
Thank you Helioisphann.
The HP is the original LCD2, the very first edition. When I bought it, I didn't care much about the details of the constructions.
Somebody told me that's made of bamboo and I stand corrected by heliosphann.
Interested, do you have the case? PM sent.