Are all bottom stamps and impressions for a particular California ceramics or pottery manufacturer the same?
Definitely not. For some of the more popular manufacturers (like Gladding McBean, Metlox), there are 100s of different stamps. This is especially true when the manufacturer decides to include the name of the line or pattern on the bottom. In addition, backstamps did change over the years slightly. Also, sometimes they just decided to make a new mold that had a slightly different backstamp – even for the same pattern.
