When assessing an antique tea cup you can glean a lot of information about it by researching the markings that are stamped, impressed or painted on the underside of the items.
To do this you'll need a few antique tea cup books, and Internet access.
Mike Wilcox of Wilcox & Hall Appraisers gives the following rules of thumb: Small hand-written marks tend to be used before the 1800s.
Printed or stamped marks in colors other than blue tend to be post 1850.
In identifying and dating postcards there are specific eras, defined by both style and dates; however, these dates do not account for the transition from one era to the next.
It is important to remember that these “Eras” refer to the printing on the back of the postcard.
This differs from postcards identified as Real Photo, Art Nouveau and Art Deco.
The naming convention of these examples are classified by the image on the front of the postcard.
You may find some items with your tea cups that are not immediately identifiable.
This is because antique tea cups were around before tea bags.
“In a raid early this morning police captured three philatelists.” Nevertheless, these are the actual and proper names for postcard, coin, and stamp collecting, respectively.