My Alfa pet peeve
Andrew is right. There should be three marks. Once you clean the pulley, you can mark them with various colors to see them better, and possibly also paint the marker. Which brings me to my Alfa pet peeve. Only an Italian could put the timing marks on the opposite side of the engine from the distributor. Unless you have six foot long arms, you cannot move the distributor while watching the timing marks to set the timing!
(2) 1967 Duettos (currently being made into one decent driver)
1995 Nero & Tan 164Q as a second daily driver (at least in the summer) and 164LS repair project
99 Ford Taurus SHO (my daily driver, especially in the winter)
07 Jeep Grand Cherokee (Wife's DD and to haul the boat).