Are Brown Grolsch Bottles collectibles now?

[bingggo]

I was cleaning out my bottles and thinking of selling the Grolsch. I found 30 brown ones. I see them selling on Ebay (mostly US Ebay) a lot, like $10 a bottle as 'vintage', but look just like mine, which I don't think are prehistoric.

Have they become collectible? Seems a bit crazy

Cheers,
Bruce

 

[MHB]

They used to sell Grolsch Amber in the brown bottles, great bottles but antique I think not.
Mind you if anyone wants to give you $10 per, take it, you wont make a profit like that often.
Mark