I picked up a very cool wrench over the weekend. I am excited to add this wrench to my small, but growing, Ford collection.

I'm not sure what this wrench is...if it is a Ford auto wrench or a tractor wrench.

Marked "Ford" in script on one side, and 3Z646 M on the back side.

Does the "M" stand for Moore, a tool supplier to Ford?

This straight handled wrench measures 7 7/16" long overall, and the jaws measure 5/8" wide.

Any ideas?

Thanks!!!!!!

What you have is a Ford dealership tool for a Model T.  It is simply listed as a open end wrench.  The 3Z-646 part number was used starting in 1917. The part number was changed to 5Z-195 in 1920.   I believe the M is for Manzel.

Wow!!!! Thank you!!!!

I didn't find much with a Google search, but the 5Z version came up.

Thank you so much!!!!

The 3Z-646 is Ford Model "T" service tool listed as "Open end wrench (9/16", 7-1/2" long)" and was issued between October 1917 and December 1920 when it was replaced by 5Z-195.

Thank you so much!!! I really like this wrench, and it is nice to have it identified.