Please help identify this Senenich prop

[Ed OK]

I have an old Senenich propeller, 69" long, with canvas on ends and brass on leading edges with following IDs

on Hub is stamp number 88

on prop itself following DES 69; NO. 1588; ATO 586

and help with what this might have been used on or date produced would be appreciated

[Dave]

It could be any of the 69 inch props on this page (i.e. ones with a "69" prefix), and was manufactured between 1932 and 1942.

I think "ATO" is actually "ATC", which is the Type Certificate number.

[Ed OK]

thank you Dave