I bought myself a Minimoog in Paris a few years ago, with S/N T2227E.
Could someone tell me when it was produced ?
Have you tried to find the quality controll sticker yet?
it is a yellow paper tag.
It is on the panels housing bottom.
So you have to put as gently as vertical as possible and use a mirror to find it then on the small side of the aluminium housing pointing to the bottom plate.
You might also find some clues inside the Minis panel housing.
But take care, if you not used to open electric units!
And pull the mains plug before 
I believe yours is part of a special run of “E” serial number Minimoogs made around March of 1973. The “E” designates the European market - so the voltages on the transformer would allow for use in the UK and Europe.
I have seen several with this “E” designation in the #2200’s range, just like yours.
Mine is not a “made for Europe” 
but was made the end of February 1973 and is in the 208x range.
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