There were two obvious differences between the first-rates built between 1700 and 1750 and the other three-deckers of the second- and third-rates.
Kwakukho emibini umahluko phakathi yokuqala thelekelela ngesantya ekwakheni phakathi kwiwaka linamakhulu asixhenxe kunye namakhulu anewaka elinamakhulu asixhenxe namashumi amahlanu.