Vintage LEICA Camera Flash Settings Instructions Booklet 1950s?

Description

This is a very nice original vintage flash settings booklet for the synchronized Leica camera with red synchro-dial. The booklet is not dated but I'm sure it is 1950s. Measures 4-1/8" x 5-7/8" with 16 pages. I believe this is for the If, IIf, and IIIf cameras. Condition is very nice.
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