The Bounty did have less guns, generically the model could I suppose be classed as a small frigate or sloop but that is as far as I can guess, its relationship to any real ship is tenuous.
It is what I would call a 'furniture' model, being quite crude in parts but having a certain curio appeal, but not what could be classed as a serious scale model.
if you like it - go for it; whether its worth a starting bid of £99 I don't know