M131002a
Crowned shield with "CCC", above "IMPERIAL BOHEMIAN" and "CZECHOSLOVAKIA".
One claimed explanation for the "CCC" initials I received was that they stand for the Carson Crockery Company (Denver, Colorado), which had items custom-marked for it by the supplying factory.
It is peculiar that the standard wording "Imperial Bohemian" was replaced by "Royal Bohemian" in the "The Kingsford" series. The only other series I found besides The Kingsford was named Monterey.
M131002a
Crowned shield with "CCC", above "IMPERIAL BOHEMIAN" and "CZECHOSLOVAKIA".
M131002b
Crowned shield with "CCC", above "ROYAL BOHEMIAN" and "CZECHOSLOVAKIA" (and "THE KINGSFORD").
M131002c
Crowned shield with "CCC", above "IMPERIAL BOHEMIAN", "CZECHOSLOVAKIA" replaced by "GERMANY".