Sorry, Mach 1.5, can't really help with this one, but the earlier little 50 is the one that stands out as being sadly missing from my HW inventory.
I do gather that they are blooming lovely, though. Was it oft quoted that it was one of the Weihrauch brothers' favourite rifles?
My only personal experience was handling the one that belonged to Robert Thornley, Steve's son of Kestock Conversions fame. It felt absolutely lovely. And I wanted to buy it, but he wouldn't be parted from it.
When I saw Robert a couple of years ago he informed me that, sadly, some scrote had broken into Steve's shed and stolen it, along with a few other bits.
Must get one, one day.