One of these vehicles was still in it's original box, which says "Scale: 47:1" on it. That would explain the slightly oversized look next to 28mm - most people think 28mm is best served by either 1:56 or 1:60, both of which are a good bit smaller.
Interestingly, although Matchbox put a whole bunch of other information on the bottom of each vehicle, they didn't put any scale.
Still, the cars will work regardless, and I'll use the trucks for now, secure in the knowledge that if I find more in-scale trucks later, I can sell these on EvilBay for fairly stupid prices!
