I've got a 13' Hyside Cat from 1992, with military valves.
No leaks, no patches, 20-30 days per year for 20 years.
Mostly bouncing down Class 3-5.
Very durable boats and roll up easy if you must rig every trip.
Very good boat for tight, steep rivers, spins on a dime.
Bounces off rocks well so good for Colorado low water.
Favorite runs: Pine Creek, Numbers, Slaughterhouse, Clear Creek.
It's in storage for the winter or I would look at the serial number.
Down River can probably help you with the serial number.
Have no idea what the weight capacity is because it is not my GC boat
Although a friend from Basalt has had his 13' down the GC five or six times.
Works fine for one person and gear on a Middle Fork.
But preferred load is a 6 pack, rescue bag & lunch.
Great boat for day trips.