The photos on Ricardo (showing the "Orange Hands" guy) were so poor, that it is difficult to see the "telltales", on this particular watch. Usually we can find a telltale on the dial, but it is difficult here.

Still, there is no doubt that the movement is different, with the jumper springs for the minute and hour recorder being one of the obvious differences. [Reference photos shown below]

It seems possible to me that there could be 149xxx Chronomatic Carreras . . . we have seen these sorts of gaps from time to time in various models and executions (for example, the Chronomatic Autavia 1163 MH) . . . so it does seem possible that Heuer made the first batch, then -- at some later time -- discovered some extra dials and made a few more of these (with the 149xxx serial numbers).

Jeff