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.
Auction and sale of 1971 SEAT 600 E model - SoulAuto
Classic 1968 Fiat 600 D Seat For Sale. Price 8 900 EUR - Dyler
70 years of history
Seat 600 1962 4/600cc - Artsvalua
40+ Free Seat 600 & Six Hundred Images - Pixabay
Seat 600 spain hi-res stock photography and images - Page 2 - Alamy
SEAT 600 D SERIE 2 - 1968 For Sale
Seat 600. 1962. 4/600cc. - Artsvalua
Seat 600: Most Up-to-Date Encyclopedia, News & Reviews
Vintage cars for sale and youngtimers for sale Auto Motor Klassiek
Fiat 600 car hi-res stock photography and images - Page 7 - Alamy
1968 FIAT 600 - Creative Rides