These mugs are sometimes called Thumbprint and Coin Dot mugs.  A unique shape with horizontal striations and dime sized dimples and a different heat ring and handle.  Also unusual is that the mugs come in two varieties, those that are painted solid colors, and those that are painted directionally.  That is, on some mugs, they were painted only with the spray nozzle pointed towards the top of the mug, from the bottom so that the top half of the dimples were coated while the bottom half didn’t receive much paint..  Looking at the mug from the top will look much different than looking at it from the bottom. 

Also interesting is that the colors from one paint style to the other were not carried from one to the other.  I believe these 9 mug colors are all that were available in the Camelot mug shape.

Solid color mugs – paint covering the entire surface
 

Directonal mugs – painted from the bottom only

 

Notice the pronounced outer-edge heat ring, similar to a genuine philbe mug’s but with much more mass.  The stamping indicates 1950s era manufacture.  Click here for a larger picture.

Here is a new find, somewhat rare, a white, never painted Camelot mug.