Legend has it that 1000 pairs of HP1000 reference cans were hand built by Joe Grado himself, as a final swan song before retiring. This is the top of the line HP1 model, with polarity switches on each side. Original box, headphones all original except for the earpads, some minor paint loss(see first photo). Extremely rare, these always seem to sell immediately when they appear for sale. Stereophile review
Note that the last 2 photos do not include (alas) the HP1s for sale here…although the one being assembled could be?