Here is a little history on this American pottery shard:
INTERNATIONAL POTTERY CO TRENTON NJ: Henry Speeler established the International Pottery in 1860 and in 1868 admitted to partnership his two sons under the name of Henry Speeler & Sons. Edward Clark and James Carr purchased the Speeler works and in 1879 organized the Lincoln Pottery Co. The names of Burgess & Campbell, their successors, were also accepted by James Carr and the Mercer. After Campbell left Burgess, the mark I have posted was used by Burgess & Co. starting n 1903. (crown in a circle)
Read more at Books.google. Title: MARKS OF AMERICAN POTTERS by Edwin Atlee Barber.
I read the funniest thing when searching for information on Burgess & Co., so I must share this for the laughter. The blog comment was found on: www.foundcollection.com. The author, 'Cal Beac' was helping to identify a bowl from 1910 for another person:
"It is an American pot, made in Trenton NJ. Although it is marked "Royal
China, Burgess and Co." , the mother company is International Pottery Co. L.
Barth is the distributor. Have a hearty laugh reading this story he shared.
I never have any luck selling chamber pots or wash sets, unless I can find
someone just becoming interested in old things. For most other collectors,
they are just a little too big for a display cabinet or table. Sometimes I
engage in the despicable practice of giving them away as gifts. However,
that practice came back to haunt me once. I gave a friend an old chamber pot
as a house warming gift without any explanation as to what it was. She had a
little party a month or so later, and when I arrived, there was the pot, on
the table, full of punch. Now, I am sure time and many cleanings had purged
that pot of any trace of its original, uh, contents. However, I just
couldn't drink from it. Seems no one else could either. Someone finally told
her what it was, and since then, I have never observed it out in her house."