HI, Just seen this so sorry for any delay
They sell a lot of these scopes in the USA, and they only go for between $15-$45 at auction. They seem to do best with the original "tip off" mount (think a rolled steel jobbie a bit like on the old BSA / Webley 1970's scopes, but better made). The B6 model seems to do better.
That said, that Parker Hale 3/4" mounting is an interesting looking bit of kit, much better made than the original mounts, and although I have no idea of what it could fetch, P/H stuff of any description normally does really well, so it may well be worth putting it on the evilplace as you may get a nice surprise, especially if you list it in also in Australia and the USA (both places where period stuff for .22 rimfires has a strong following).
The buyers in both Australia and the USA will bid very high for that special thing they want, and I imagine a mount like that would be quite a rarity in both places.
This is from my experience of selling to both countries, but pack and weigh carefully before listing, and only offer international signed for or airsure options.
HTH,
Regards, Ed