I assume that guy had the metering on the primary as well - after all the PoCo wants to use their own meters and they most definitely won't supply a 120/240V 3w meter.
The US facilities in Germany have extensive 120/240V systems, but as far as I know they mostly use German switches and German-made NEMA receptacles that fit German boxes. Supposedly I can get my hands onto some of those next spring, definitely going to post pictures then!
Earlier this year I saw a house in Austria (near Vienna) where I suspected 120/240V wiring too. The whole place was just so incredibly American in style, it was hard to believe. Like a miniature version of the Capitol with some brick thrown in.
Here you go (just linked since it's really OT and I already had it uploaded to my Photobucket account)
https://i17.photobucket.com/albums/b82/W_e_St/Bisamberg/P2240042.jpg
