Yam BB1100s fretless - is £425 a good price?

[TheGreek]

https://www.gumtree.com/p/guitar-instrument/vintage-yamaha-bb1100s-fretless-bass-guitar/1261722688

[anzoid]

Also on eBay with a start price of £350 - so if you're interested maybe an offer would work...
Searching for "Yamaha BB1100s fretless" shows that a "Buy it now" one went for under £325 at the beginning of June - the £325 is crossed out which I think indicates that a lower offer was accepted. It was collection only though which tends to knock a few quid off.
My experience with fretless basses is you get less for 'em because it's a smaller market - so an offer right at the beginning of the listing (Gumtree and eBay) might be quite welcome from the seller - I know when I've sold frelesses I've always wondered whether they would sell