You've probably seen hip young parents spiriting their children around Pittsburgh in a rear-mount bike seat that looks both safe and comfortable. These seats are made by Thule (a Swedish company famous for high quality outdoor products). We are selling a Thule Yepp Maxi rack mount bike seat (blue) in like new condition. This seat sells for $249.95 new (https://www.radpowerbikes.com/products/thule-yepp-maxi-child-seat?_pos=1&_sid=8d5879ce5&_ss=r).
Note that this is not the frame-mount model: you have to have a compatible bike rack in order to mount it. The rack must have a space long enough to accommodate the base of the seat (see photos). The rack should be rated at lease 50 lbs. (for use by a child up to 40 lbs.).
Here are the important technical details:
Designed for children from 9 months to 6 years and up to 40 lbs (but consult a pediatrician for use with children below 12 months).
Shock-absorbing seat
Made from easy cleaning, water-repellent materials
Padded 5-point harness
Childproof safety buckles
Built-in reflector
Adjustable footrests and foot strap
Locks securely to bike rack (see keys in photo)
We have had this seat for a few years, but used it very lightly and stored it under well-controlled conditions, so the quality is like new.