This tea service was made by Chelsea, the oldest British porcelain manufacturer, started in 1743. Porcelain was still extremely rare and expensive, especially in the colonies where it had to be imported. Britain made two types, "soft-paste" and "bone", neither of which were a true "hard-paste" porcelain. Designs usually mimicked Asian & continental European models, like this French-inspired set. You'll notice the cups don't have handles, which wasn't invented until the 1740's.