Here is my 2 cents
I can say that most bases were wood at the beginning for most pistols.
But in the mid 1920's aluminum was told to be used (Simson used them from 1925 on, except for a few hundred that were wood bases) while the military stated that as wood was used up, aluminum would be used (1926 on).
Then in the early 40's bakelite started to be used for bases, cost and materials I am sure.
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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