Loads of great options, most of which will need a proper professional service by now, but I’d put a recommendation in for an old Nikkormat FTn. It’s basically a simplified Nikon F or F2 (can’t remember which), so no removable prism, different heads, motor-drive options, alternative backs etc, but much of the same astonishing build quality, lens compatibility and basic bomb-proof functionality. They are great things, but very heavy (that build quality!). I personally love the fact it has no flash hot-shoe as it removes one key way to take awful pictures! There was an add-on one, but obviously you shouldn’t buy it. Not sure what the prices are these days, but they always seemed undervalued to me as they lack the street cred of an F or F2, and were about a third or half the price of an FM or FM2 despite being much the same thing aside from being a lot heavier (again, the build quality!). I’ve not run a film through it for so long now, but every now and again I pick it up and have a play. It is a lovely thing. An early one, I’d guess at about 1967.