Some pottery valuation sites

 https://avaluer.org/search/fine_porcelain

teapots

http://anoldmansstuff-ca.3dcartstores.com/James-Sadler-Sons-Ltd-Windsor-Creamer-Sugar-Bowl--Made-In-China_p_1149.html

Starbucks Database & Info

 https://starbucks.collectionhero.com/