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It looks like this ashtray is made of some kind of nickel-steel and has a thin layer of chromium electro-plated on its surface. This layer was already somewhat peeled off when I'd first received from a friend who'd sent it from the USA in 1980. Obviously, he'd kept it for several years before passing it to me (I'd sent him a few coins in exchange). The natural ageing process made this item looks like antique, but there's no rust on it.
Remember, never clean or polish any nicely toned item like this 'coz if you do that, you'll wipe off its collector's value.