It is the 22lb limit Graco Snugide-it was a part of a travel system with a matching stroller, the print is "Mulberry" and it was recently clearanced... I'm 110% certain
My good friend has/had the travel system and she JUST traded the car seat in at BRU a month or so ago for a MyRide... I know it is recent as it's her first child, travel system was bought new for the baby and the baby is 7 months old
Unfortunately Graco is still making plenty (far too many IMO) rear adjust SnugRides...
9 times out of 10 they are part of a travel system.
You found it at a thrift store? I'm guessing you didn't buy it, maybe you could let the thrift store know the dangers of buying/selling used car seats... most people wouldn't think twice but it's a huge risk/liability given they are not authorized dealers and they aren't selling them new. Most consignment/thrift stores will not accept or sell car seats and they shouldn't be either...