I recently purchased a late '73 240Z from a salvage yard and it has an interesting set of wheels. They appear to be Nissan wheels, but I haven't found any specific information on them. I did come across a few photos in the gallery posted by somecreep, including this one:

http://www.classiczcars.com/photopost/showphoto.php?photo=15054

Does anyone know anything about these? Here are some photos of one of the wheels on my car, including the stampings. Looks like mine are missing the center caps.

Factory alloy wheels from an '82 200SX, part of the "Sport Group" option package (wheels and sunroof, some "Sport Group"!).

May have been available on other models in other parts of the world. But it is unlikely that this style was in production early enough to be offered on 240Zs in France, as the caption of that one gallery picture notes the French owner claimed.