So I can confirm there was never a gxa242 certainly never in the UK, of all the test saws I have seen there will not be a model on the plate just an etched ser no. There will also be a decal saying it’s a test saw, all test saws will be logged and returned to the factory after the test period, any additional add on to the saw would be included under the model decal on the starter, such as G for heated handle, there was a version with a catalytic muffler that did not catch on, the 42 and 42 Special was the semi pro version with open port cylinder, the 242 had a closed port cylinder. So I can be pretty sure there was never such a model, is this on the ser no. plate?