According to Richard Smith (Fender: The sound heard ‘round the world) during ‘54-‘55 Fender shipped 720 Stratocasters against 1027 Telecasters. The turnaround slowly began in 1957 when Buddy Holly had a lot of airtime playing his famous Stratocasters. Count the 4 years head start for the Telecaster and it’s very likely, as I stated before, that there are more 50’s Telecasters as Stratocasters. However there is no way to be absolutely sure because there is no official data. It’s funny, because Leo created the Stratocaster to replace the Telecaster, but both had their place in history and both have become icons.