I'm not sure here, but I tend to fall back and go with the great work of John Walter, he put much research into his book and MauserLuger can not state a reference to back up his claim. I wish someone would post in here who has additional documented information....yes I have seen and owned few blue tubes as compared to tin/plated, but Walter never said they were made in great numbers, just documented that they were made....it's all fun.
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