The Asahi Optical Co had a winning formula with their Spot SP from the late 1960s-early 1970s.  Beautifully made solid metal which with usual care will last many more decades. The M42 screw mount gives access to a wide range of legacy lenses, some of which leave modern glass in the dust. The light meter. due to in camera circuitry can use a modern 1.5V silver oxide battery which are reasonably available. Our example here is Japanese manfactured in A+ cosmetic condition and operational in all aspects including the light-meter. Fresh 1.5V battery for NZ purchaser and pdf manual.