*2/9d in 1956 would have bought you one of several of the first issue of Corgi Toys. Or you could have spent *4/- and had one with a Mechanical motor which had a flywheel providing a continuation of the car's journey under its own steam. The trouble was that the continuation would be just a matter of inches and invariably resulted in the model crashing into the skirting board, a table leg or another model. The model was heavy and just a bit cumbersome. Whilst you could speed in the others, these versions just wouldn't do that, even if you did add oil to the little hole provided to help the gears do their work. The extra 25% or more just wasn't really worth it to many collectors and Corgi abandoned the idea sometime in 1959 with the models ceasing to appear on dealers' order lists in 1960.
Now the comparative scarcity of these models has made them eminently more collectible than the 'normal' issues and they're getting hard to find in reasonable condition and with a motor that still functions.
I have just added a section to my Catalogue to enable people to find them all quickly and see what colours they were sold in at your local toy shop.