I'm forever nine years old when it comes to little metal toy cars. Hot wheels are delicious (to see and "drive" across the table), but I graduated to fancy models of old Cadillacs and such. I've become the family go-to guy for buying small boys toy vehicles. I just look for ones I can't resist. I only wish these stamps were in a nice folding book that slides in your wallet. Many of the limited issue stamps are done in sheets, and I find those hard to use. Sheets are never where I want them when I'm ready to mail something. My all-time favorite toy vehicle was a trailer truck auto hauler with six little cars that rode on the trailer, 1940's vintage cars. Not excruciating detail, but nicely done and durable. I must have played with that set on into middle school, privately of course. The household cats play hell with my little cars that are supposed to be parked on windowsills.