Firstly, are sure it was K reg? K plates ran from 1971 to 1972. Secondly, although SEAT has been making cars since the 50's they were always named by number, i.e. the 800, 124, 127 and it was only in 1984 they started using proper names - the Ibiza, Malaga etc. Saying that, Moraira is a small town in Spain (and I mean small) just up the coast from Benidorm so it's possible it could have a been a limited edition e.g., the 800 Moraira but if it's really bugging you why not email Seat?