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Bit big for me but about £450 is probably the absolute upper mark on here for a mismatched ss bike that will only fit a handful of people.
Maybe pop it on eBay for a week with a reserve at your current asking price to gauge its desirability?

It’s a really nice bike but on here(where folks are into their retro mtbs) they’re just going to give you a gentle roasting for asking full retail for used parts.