I have done some more looking and I have found that blade model listed in a US Navy publication: Propeller Application and Parts, Section 8701A, First Edition, January 1945, page 59 for the blade item # 18, and it could be used on an Airship ZNP-K3 to K8, for page 3.
It is a ground adjustable blade. This document is in AirCorps Library and you can not copy the content without purchase.