What is the exact year of the boat?

[Monsterfish]

Can anyone tell me the EXACT year of the make of this boat? I have attached the picture of the plate. Thank you!

 

[Breeze Bender]

1970

 

[Monsterfish]

That's interesting. How do you determine that?

 

[Breeze Bender]

That's interesting. How do you determine that?

http://www.sunfishklasse.nl/documenten/Sunfish%20Timeline.pdf

 

[Monsterfish]

Thanks a lot! Much appreciated!