Hi Miriam
The 320k was a really short series I have read somewhere. only about 2000 made in total! she is my go to machine, just love her!
I have a 66 too ( I thought it was a 99 as I can lift it quite easily and I read that 66-es are really not portable, just dragable) I was raised on a farm though so I suppose those bale made me stronger then most ... she is really pretty but you all have seen so many of those.
I have a husqvarna viking from the 2000 series but I count her as semi modern lol '78 or so