Hi Ollie,
BTW these certainly aren't Unicorns as there still are plenty out there to be had as you've just found out.
I've always felt that it's all about the width of it and with it being a 20 inch machine they were always in the minority due to the price of them when they were new. Honestly it's become a bit overrated from where I see it, but this is something that's been driven by the Facebook crowd.
The Series 1 machine was always the better unit opposed to the Series II twin railer which just about every single one of them by now has failed in it's chassis and been repaired in some way, shape or form. The S1 was simply stronger due to it's one piece engine deck.
So you've finally got one ! and that's just a 45, but you've managed to secure a 20 to boot. Well done I can tell you are doing cart wheels internally, now the question beckons.......................................how much did it set you back and how did you manage to find it ?
The next question you are going to ask is about it's originality, right ? well it was originally powered by a Kirby HK30 which probably by now had started giving all sorts of issues and the way it is with parts for them makes it just easier to hoik it off and simply replace it with a Briggs unit of some sort as they are plentiful on the ground. At this stage I'm not sure if that Briggs is all original as it seems as though the air cowl has been changed with one from an I/C unit while the engine itself may be an earlier issued block and head assembly.
Cheers,
BB.
PS. What's that extra machine in the photos, should it be here in this lot as it's a different mower altogether ?