Hiding my head in shame here.... 'somebody I know'... ;-)... has an amount of 'O' gauge model railway locos hanging on his wall, collected over the years....
Current value??? F*ck all!! There is zip/zero/niente interest in the stuff these days. Adverts spring up, and stay there, week upon week.
One large retailer commissioned a range of locos/carriages/wagons, within six months they were being advertised 'at cost'.
My bike attracts very little attention from youngsters, luckily I've never bought 'for investment'. As I've said before, I reckon it could easily end up as 'landfill' because I reckon the marketplace when I expect/hope to die will have shrunk due to a myriad of mitigating circumstances.....
IMHO