where do i find a model on this thing?

[The_MilkMan]

hey guys, i just boat my first boat, its a 1976 glassmaster tri-hull, with a 35hp johnson outboard on it. i started looking around the forums here, and i noticed everyone was giving models too. when i went to look at mine tho, i could only find the model for the motor, rds-20. so, where would i find what model it is? and help would be greatly appreciated, much thanks!