Thanks, I think that answers my question, they were available in 1960!
Really love the way these pickguards age to a mint green, very beautiful !
Im actually eyeing up a 59/60 precision at the moment with three ply white pick guard and wasn't sure it was original as all the ones I could find on the web had the gold aluminium. It could fit quite nicely as the serial number puts it 59/60, slab neck and no date pencilled on the neck which is correct for the period! If they started using these pickguards around this time too.....