[EvertonMint]

There are quite a few online shops in the UK selling a "Koss Portapro-BBC", they look to be standard Portapro's but are all black (no blue/red housing), and a black and white cable.
 
They are slightly more expensive than the standard Portapro's and have an "enhanced frequency response"....
 
I can't find any reference to these on head-fi (or anywhere else), so has anyone tried these?, do they sound different from the standard Portapro's???
 

 

[miyinan]

look like they are just the 25th Anniversary ones.

 

[EvertonMint]

Ahh, I see, thanks for solving the mystery...I wonder what the BBC part is for though? (British Broadcasting Corporation....surely not).