The Diamond back brand is relatively new. it was actually the predecessor of centurion, a brand of WSI an american company who manufactured and exported bikes from japan. in the early 80's WSI introduced the diamond back brand for their mountain bikes and later for the BMX series. throughout the 80's both names were utilized until centurion was dropped in 1990. Great article from sheldon brown on centurion models here. Used hybrids are hard to come by as they are pretty modern bikes, the first ones were produced in the late 80's. Most bike companies started offering several models in the early 90's. They are considered all around bikes and it seems like they are probably the best selling bikes right now. They are so popular that people who don't even know what a hybrid bike is, still want one. Hybrids rarely stay in our shop for more than a couple of days and women's hybrids with an open frame such as this Diamond back approach usually don't survive 24 hours in the shop in the biking season as usually the first person to try them will make a purchase.
We usually replace tires on all of our bikes unless it's clear that the tires are recent replacements or of high quality, these tend to survive for longer period. this Diamond back approach has undergone the standard refurb and was fitted with new tubes, cables and brake pads on top of the tires. More diamond backs we refurbished here and a brief history of Diamond back and its predecessor Centurion and also a wiki page on diamond back