Pulsar chrono

As you might have seen from my other post i have ordered a Pulsar chrono over the internet. This is a civilian model of the current RAF chrono. The model I have orderderd is a PJN299X1. I have seen also a PJN299. There seems to be no difference between the two. Are they the same watch or is there a small difference between the 299 and the X1 version. The watch is cheap enough at about £50 for a chrono is not that bad. The ones in service seem to be very nice so I thought I will give it a try. Anyone had any experience with them?

Regards

Nimrod