That is a nice looking piece of kit mate good luck with the sale
I know these are the best and are certainly not a toy but have they not been made redundant by the compact binocular and spotting scope? Just seem an awkward thing to use.
I find 10x binoculars very useful on the hill, but depending on what sort of ground you've got, and how well you like to check beasts for shootability before you climb up and stalk in, something of 25-30x can be invaluable.
I'm not sure what sort of spotting scopes you're thinking of, but I've had a Schmidt and Bender 15-40x60 three-draw, an Optolyth 30x75 single draw and an Optolyth 15-45x60 no-draw up various hills, and my view is that the traditional Gray-type glass with its length and lightness is a good deal easier to use than the shorter glasses I've described.
I use a 40-60 Swarovski HDS 80 HD and i sometimes use a window clamp for lamping fox and i would hate to use a telescope for that. Maybe on open hill they would come in to thier own.
I think that's it: on the range with a tripod, or from the window of a motor the stumpy ones have an advantage.
Although not for me, I did on the odd occasion use a freind's (stalker) in ardgour a few years ago,
as he said they fall into thier own for open hill, for which they are the dogs doodahs !!
but then again so did his Rigby 7x57.
All the best with the sale.
"let him without sin cast the first stone"
Do you know if it is the newer model with the wide angle lens?
Sorry no idea you will have to ring Richard