Yes Lawrence: the Plessey Mark 4 connector was available with many different numbers of poles. More bits 'n' pieces are now coming back from my memory. The lowest number was 2 poles and I think the highest number was 36 poles. Each pin is identified by a letter of the alphabet, A - Z then into lower case after Z has been reached. And what Alan has said about specifying the config. at ordering time is correct. When I was employed in a Gov't. R & D organization many, many years ago, Plessey Mk. 4 connectors were available from Central Stores. So the first thing was to look up the description of what you wanted in the catalogue and thus obtain the NATO Stores number. If I recall correctly, the orientation (as well as the number of ways, chassis mount or 'free' plug, male or female, bayonet or screwed, etc.) was all encoded in the NATO part number. Surprisingly for a NATO / Government Scheme there was actually some sort of logical system to the numbering style that reflected the variants! 
All a long time ago now - but they were happy days- and my enthusiasm was then boundless.
Aside: Yes, now fully recovered from that awful dose of 'flu: thanks for asking.
Al.
All a long time ago now - but they were happy days- and my enthusiasm was then boundless.
Aside: Yes, now fully recovered from that awful dose of 'flu: thanks for asking.
Al.
