This model came prior to S2 and S2A and differs on several points. Here you focus using the wheel on the side, just like most TLR's, and in my experience by far the very best way. The S still also had a mirror lockup just underneath the shutter button!
It is all mechanical and uses no batteries.
Shutter speeds from 1" to 1/1000.
The mounted lens here is the Nikkor-H 50mm f/3.5 is sharp and renders amazingly!
