You can see over the years it's had a number of cracks that have been cut out. You can certainly get good use out of it if you're looking for a quieter practice cymbal.
Vintage Paiste Formula 602 Thin Crash 18" Cymbal 1421g. Free P&P
Vintage PAISTE Formula 602 Medium Ride Cymbal 18 inch 1970s Used Drum
Paiste Formula 602 20" Thin Crash Cymbal
Paiste Formula 602 Medium 20" Ride Cymbal 1982
Paiste Formula 602 20" Medium Ride Cymbal
Paiste Formula 602 13" Thin Crash (Rare, Vintage)
