Probably old hat to you guys but the first I've ever seen. Appears to be spark plug/ head bolt (5/8") tool. Marked Ford with the # T-5893. What years? Columbus Flea Market $3 special.
There are guys on the forum who are experts in Model T tools. All I can say for pretty sure is that the wrench pictured was a part of the T tool kit and therefore must have been supplied for many years.
Bottom Line Up Front: It is the spark plug and cylinder head (also fits demountable lugs but the wrench came first and just happens to fit both) wrench. Introduced around 1913 or 1914 depending on the reference.
From the encyclopedia Trent’s article has:
“ …T2335 combination socket and open-end wrench about 1913. The T2335 wrench design, used for head bolts and spark plugs, continued into
the Model A era with minor changes.
From the thread at: http://www.mtfca.com/discus/messages/179374/249390.html Larry Smith added it came into use 1914 (model year or calendar year?).
There is a more detailed posting at: http://www.mtfca.com/discus/messages/331880/342802.html?1361147232 that has additional photos of the wrench over the years.
Hap l9l5 cut off
There are several versions of this wrench. Its Model T parts number is #2335.
Top is 1913 or 1914 to around 1920.
Second is the 1920-1927 style, still #2335
Third is the TT version.
Fourth is Ford V-8.
I think #3 is a Model A. The top one came out in mid year '13.
I am not sure, but had been told the model A wrench looks like the model T (second from the top), but that the spark plug end is a bit larger than the model T size. I have had a few that fit that description.
The third one from the top is a model TT truck wrench, so I have been told.
Drive carefully, and enjoy, W2
Yes, the A wrench looks like #2, not like #3!
The T wrench is on top, the A below.
There are several variations of the A wrench, the difference being on the other end.
The enclosed end wrench, like started this thread, are all Model T.