For these models, year is "1980+" and "MkI".
http://www.imcdb.org/vehicle_76682-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_268242-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_364346-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_1070493-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_1441737-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_1449151-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_1490393-Reumech-OMC-Casspir-1979.html

For these models, year is "1981+" and "MkII".
http://www.imcdb.org/vehicle_79740-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_138916-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_150675-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_236495-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_264232-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_416757-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_416758-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_426136-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_565144-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_434411-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_569397-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_625053-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_635562-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_849090-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_1026346-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_1092219-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_238507-Reumech-OMC-Casspir-1979.html
http://www.imcdb.org/vehicle_727332-Reumech-OMC-Casspir-1979.html

For these models, add "MkIII".
http://www.imcdb.org/vehicle_263194-Reumech-OMC-Casspir-S.html

Source:
https://manualzz.com/doc/36379304/casspir-mk1.indd
https://en.wikipedia.org/wiki/Casspir#Production_history