Always eager to learn more about my teawares, I recently found a discount copy of a book I'd been wanting, "Miller's Pottery and Porcelain Marks" by Gordon Lang. I got the 2001 edition for about $5, and I absolutely love it! The book measures about 3-3/4 x 7-3/4 inches, so it's practically pocket-sized, but it packs a heap of info into its 400 pages.
"Miller's Pottery and Porcelain Marks" is a very user-friendly guide, and most of the pages show a pottery mark in the small left-hand column and then a description in the larger right-hand column.
Here are seven marks I photographed from random teacups. You can look up makers by name, by initials or monograms, and even by "devices," such as crowns, shields, anchors and globes. Only when gathering pieces for my photos did I realize my blue Swinnertons teacup and saucer has a teapot depicted as part of its mark! (Double-click on the images for more detail.) Sometimes I had to use the book as a beginning point to surf the web for more information, but with this book and the internet at hand there's been no mark, no company I haven't been able to find, and that is well worth the price of this book!