This PC-1S cartridge is the improved version of the original PC-1. It is now extremely close to the PC-1 Supreme in performance. It has only 180 hours. This value is derived by my having tracked the total number of LP sides played and taking the average LP side of 18 minutes. The average break-in time for this cartridge is 100-125 hours. The cartridge is in perfect condition and the accessory packs are sealed, never having been used. See Marshall Nack's review at PF Online, http://positive-feedback.com/Issue70/air_tight.htm. I am the original owner. $4250 (retail $8500). Buyer responsible for shipping and PayPal fee. See my extensive sales feedback on Audiogon. My user ID there is Nlevy. Reason for sale: must make room for Air Tight Opus.