Joe & Bob -
It's a Bosch.
I talked to my friend Dave, shop manager at the local Porsche dealership, and he said all the rebuilds from Bosch are much smaller than the orginals.
Nothing labeled PS on the case, only the part number and a large "1." Installed easily, and works fine.
BTW - with the rebuilt head, new chain, and tensioner, car started easily and runs fine. No more smoke, and much smoother with the new motor mounts. It was raining so I didn't drive it today, but I can't wait to try it on the road.
Chuck Taylor
1970 280SL #14076
Falls Church VA