Good luck with selling it.
Those old jap bikes disappeared because they were not built very well, nothing to do with recycling.
No one in UK wants old Japanese bikes, except maybe a one or two trendy dealers so maybe you should try to sell it in USA where they have more money than sense and were buying Japanese bikes long before us because they occupied japan for so long and could buy them for almost nothing.
In UK in the 1950s we only bought British made bikes.
There is no comparison in those links you give, they were sold in the USA, and you cannot, not ever, compare a Vincent with that Honda[even though I don't like Vincents]. Nor do one off auction prices in the USA or here even give a true market place value.
I think you are falling into the common trap of a lot of people outside the UK of seeing the stupid prices asked for a lot of bikes here by some dealers or ignorant amateur dealers and believing they are a true reflection of real prices.
Try this site, which goes world wide and is free to sell on.
https://www.carandclassic.co.uk/. you might have more luck there.