Seat built the 600 in license from Fiat from 1957 until 1973. The Spanish version was almost identical to the Italian one. The 600 D was available from 1963 until 1970. Note the doors that open to the front, not unusual at that time but later discarded for safety reasons.
SEAT History – 1950s, SEAT 600, classic cars
1969 Fiat 600 for Sale
Bonhams Cars : 1956 Fiat 600 Trasformabile Chassis no. 189947
Naval gazing: 60 years of the SEAT 600 - Influx
1964 Seat 800 for sale on BaT Auctions - closed on February 9
Seat 600. 1962. 4/600cc. - Artsvalua
Auction and sale of 1971 SEAT 600 E model - SoulAuto
Seat 600 car hi-res stock photography and images - Alamy
40+ Free Seat 600 & Six Hundred Images - Pixabay
FIAT 600 Classic Cars for Sale - Classic Trader