Though these blue-indexed Decis are actually easier to find than the second execution with the black scale in my experience, having been in production for getting on for three times as long.

I used to really like the purity of the early Carrera models without scales (S and N) but I think over the years I have become a convert to the Tachys, Decis and Pulses. I always liked the red Tachy scale a lot, mind... Anyone else have a preference?