Zeiss Nettar with f4.5 Novar lens
I bought this in 1968 for £7. [£108 by RPI in 2016] I was never really happy with it. Perhaps the limitation of the three speed shutter had a lot to do with it. Invariably had to use the faster speed all the time. For general work, focus-guessing was quite an issue so, seeing the Ikoflex, was the next upgrade. However, as you will see, once moved to 35mm and the OM1, due to its relative light weight I would still carry it for 6x6 work. Then, as now, I would use the OM1 to measure focus.
The 517/16 - also known as the Nettar II - takes 12 pictures on 120 roll-film. It has a direct vision viewfinder and accessory shoe. The style of lens bezel suggests this is a later model, perhaps 1957.
Several versions of this camera were made to suit different pockets. For example, in 1953 the 517/16 with Novar f/6.3 75 mm. lens and Vario shutter was about £13 (£324 today (2016)) whereas with Novar f/4.5 75 mm. lens and Prontor S shutter it is about £22 (£548 today (2016)). This at a time when a craftsman earned £9 15s a week, a manual worker only £7 12s.
It was discontinued in around 1958.