are there numbers in the f/glass of the right rear hull?

the codes there should tell you if it is a nacra or not

the solid glass hulls on my 1982 nacra are numbered

TRRC2158M82B

i believe the "TRRC" code is manufacturer and boat type?
"2158" is the production number, usually sail number too
and of the last bits "M82B" 82 means 1982, M and B could be a month code???

if the boat was made after 84/85 nacra had moved to foam/
laminate hulls. a typical nacra 5.2 of that time had a number like
NACR3002J586

where NACR is the maker, 3002 is the hull/sail? number, J5 could be boat type??? and 86 was 1986