Is there a system to Haeger pottery's Numbering System???

Early on, 1930- 1938 numbers were all under 1000, many lower single and double digit numbers (some with an alpha). In the 1938-40 catalog the "R" numbers start designating Royal Haeger for Royal Hickman. BUT 3 digit and four digit numbers continued in 1938-1940 from double digit through the series 2000. In 1942 all types of numbers appear, some with alphas and then the 3000 series starts, etc. The numbering was all over the board. Does anybody have a handle on how the numbering system worked at Haeger in the early years, prior to 1950? Thanks in advance. wdywdpkr

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