Ummmm, now I should know this one.

Being a dumb American..... I believe it is the same as the XLR, but synapses are not reliable with what I've ingested at 5:21 a.m.. That being pin 1 is Shield/ground. Pin 2 is +hi. Pin 3 is -low. And that's not a DIN but a Tuchle (I don't think I got that spelling right? Tuchel? Yeah, one of those.)

Then take a microphone of known phase such as a SM57 and plug both microphones in. Set your panoramic potentiometers to 12 o'clock high. Put both microphones capsules as close together as possible and make sure that you get a nice warm fat sound when both are on. If it sounds really thin? Reverse pin2 & pin3.

Live dangerously. You really can't go too wrong
Ms. Remy Ann David

You have to be a little bit careful with the wiring on the klein Tuchel connectors, as there was meant to be a standard but not all mics adhered to it. Hinton Instruments has a good site about which mic takes what and they also make adapting cables. However, the M55 is not mentioned!
http://www.hinton-instruments.co.uk/paprod/cables/vintagemic/kleintuchel.htm

Generally, as Remy got round to saying, pins 1,2,3 go to the corresponding numbers on the other connector.