Unfortunately I don't have a 1:12 gen v model. I just have the 1:12 green gen 1 model by anson.
I'll give you $50 for that one - $75 if you still have the box.
Not to be rude, but you might as well be asking "whats the value of
air" when it comes to things like this.
"About 290" doesn't help. The problem is a super-rare diecast is only as
valuable as the condition of its packaging. You may have a 1of1 hotwheels,
in the box its worth $30, out its worth $3. Without a VERY detailed catalog
with VERY good photos I am sorry to say your collection is worthless to the
online buyer.
My advice - if you want to unload it quick as a package deal then pick a number
your happy with and post it here -OR- if you want to try to get your investment
back take the time to inventory the collection and list it. As for "where" to list
if youre not a professional collector here and ebay are pretty much your best
bets - there are collector sites out there but if you think we're being picky about
details I promise those guys will nit-pick every detail (and then lowball you Gas
Monkey style...)