I photographed these four Maseratis at the Coys International Historic Festival meeting at Silverstone in July 1994, but didn't record any details about the cars at the time.
This is a 1977 Maserati Merak, a car that was produced from 1972 to 1983 with a 3 litre V6 engine. The DVLA record now shows SCB 691 to be a 2015 Mercedes-Benz.
This car is a Maserati Khamsin which was produced between 1974 and 1982 with a 4.9 litre V8 engine. No DVLA record exists for MJ 1862.
The Maserati Mexico was produced between 1966 and 1972 with a V8 engine of either 4.2 or 4.7 litres. With the registration number ending with a 'K' it should be either a 1971 or 1972 model. Again the DVLA does not have a record of EKP 52K.