tunalegs
Pretended Artist
Any camera which is synchronized for flash will have some sort of electrical stuff in it... Which basically leaves you with a Praktiflex.
Zeiss Ikon Contaflex ILooking for the thinnest good quality and build (like oly om-series) with an attached 24-60mm lens without electricity and just plain mechanical. The Om series is nice, but have rather long flange and i cant find nor afford the 40/2 lens for it.
No electricity is due to gas-rules (explosion risks) at work.
Is my old rf M2 with good old MIC 35Lux still my best bet here?
CANT BE ANY ELECTRO BUILT IN.
Any camera which is synchronized for flash will have some sort of electrical stuff in it... Which basically leaves you with a Praktiflex.

I think the "with the batteries out" options are going to be vetoed. It's for use in an explosive environment! I suspect it will also need to have brass gears (or does the enclosed body mean this isn't a risk?), and I can't say whether any of the non-Leica options do.
I think the "with the batteries out" options are going to be vetoed. It's for use in an explosive environment!
It may simply be badly drafted H&S rules. But steel gears are much more dangerous in a volatile environment than a meter circuit with no battery.
The problem with making sweeping statements like that, is that someone, somewhere, will sometimes prove you wrong...SLR's are not "pocketable".
Get over it.
If you want TTL viewing, with a convential mirror reflex system, then the 1/2 frame Olympus Pen F with a 38mm f2.8 pancake lens will be the thinnest. The 38mm pancake is rare and breathingtakingly expensive, if you can even find one. If you can't afford the Zuiko 40mm f2 for OM then you won't like the price on the 38mm f2.8.
Quite honestly your requirments are at cross purposes.
A unused cable and switch in a device without power source is not electrical, it merely has the potential to be used for electricity. Any camera made from metal will be electrically conductive. Which would leave you with some all plastics disposables, if you really believe that the opposite of "electrically operated" is "entirely non-conductive"...