OK, what do I have? Unfortunately I don't know the origin, I got a lot of Mustang/Ford parts from a shop that closed several years back. The measurements are just a bit short of 17 inches, one blade section is 16 7/8 inches tip to tip (pic 2) the other blade section is 16 5/8 inches. I made a close up of one blade section end for the FOMOCO marking in script (the other blade section is identical) and there is a number "3" and a letter "E" (both inverted to the FOMOCO) on each but very faint (pic 3).
Using the 75 edition of "Ford Car Parts" (aka MPC), I "matched" the blade length (17 inches, there are no 16 inch and fractions lengths listed) , number of blades (4), center hose size (5/8 inch), "marking" info in the description column (there is no Ford part number stamped) to come up with this C2OA-8600-B, 64 260, 289 (ex HP), and also 66 Falcons.
Any comments?
Jim