for those of us who are particularly anal about restoration, i am in the process of restoring my 750F2 calipers and the best match to the original is PJ1 satin black. however, for that authentic finish, each caliper should have a red quality control spot and after trying to find the correct colour match, i have since found out that they are in fact paint stickers. these are still available in a strip of 3 from DS under the code APR170401. i ordered 2 sets and he only has a few left. so if you are after that genuine look, order now as they will no longer be available.
