The Nikon FM represents the high-water mark of the all-metal, all-mechanical, "built like a tank" style SLRs of the 1960s and 70s, which featured rugged construction and battery-independent reliability.
Excellent, detailed description of the FM:
https://www.mir.com.my/rb/photography/hardwares/classics/nikonfmseries/fm/index.htm
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#nikon #slr #fm