Leitz - Leica Satin Chrome Finish Technology before 1945 , specifics from Army Report

http://www.angelfire.com/biz/Leica/page26.html

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Specifics of the satin finish are:

25. The satin-chrome finish on external metal parts was obtained by the following process:-

26. Sandblast, hot cleaner without current, cold cleaner with current, warm rinse, followed by cold rinse, hydrochloric

dip, copper flash, cold rinse, sulphuric dip, cold rinse, bright nickel-plate, warm...

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