Formula Yr. Id ? Any Formula 233 buffs?

[starsnstripers]

Have a Formula 233 that i have no idea what year it is. The hull # is F 2312188 and it's (NOT) an 88 The 88 formulas had curved windshields. It was sold as a 1978 but i have my doubts. After 1972 the last two gigits in the hull#s are the year. So must be pre 73. Here's some pics if anyone knows their fFormula 233s thanks for any input.

 

[starsnstripers]

Re: Formula Yr. Id ? Any Formula 233 buffs?

Two more pics