Original main traveller car was sliding metal plate
Original mast step with hook
Early '70s - mast step or base changed to remove hook
1972, '74, maybe later - main traveler with rollers
1977 or thereabouts - 3-hole mast tang
1982 - Shorter shrouds, longer forestay, modified mast step casting to allow for more aft mast rake.
1983 - double-grommeted rear tramp lacing
1984 - weight reduction 340 to 320, red adhesive
1984 - Adjustable rudder castings
1985 - Comptip and main halyard, reef points removed from main
mid-'80s flush boom vang fitting and then removed
mid-'80s clear anodizing ended
1995 - shrouds shortened from 19'2" to 18'11"
- Updated corner castings (injection moldings) and trackless pylons, integrated jib and main traveler tracks
- jib traveller with cleat on pad riveted to crossbar, Delrin sliding car
- Miracle 20-style tiller connectors
1996? - deeper jib traveler track with brass-wheeled cars
mid-late '90s - updated bolt rope in sails
2000 - recut jib?
2004 - another mast step casting change to improve rotation and hold mast bearing chip better
late 2004 - roller bearing jib traveler with cleat on car
2004~5 - EPO2 rudders standard?
2009 - shrouds shortened slightly to 18' 10.25" - bridle lengthened to 3' 9.5"