There's fewer and fewer of these little secondhand shops; usually run by elderly hobbyists that make a few (extra) bucks by selling vintage stuff. This store in Amsterdam specializes in old photographic equipment and (8mm) filmprojectors. I believe this shop is one of the few in Europe that has a generous stock of spare light bulbs for 8mm projectors.
He also has boxes full of lenses, old Pentax camera's, spare caps, straps, filters and one giant 35 mm projector (100 kilogram?) that will most likely never leave the shop. And it's all crammed up till the ceiling and organized in a way that only the proprietor will ever understand. And sometimes even he has no idea...