Michael,
Steve is correct that the digital version (available at the address on Steve's website
https://dauntlessgeezer.com/DG80.html). Barbara now sells them on a Mini-USB drive (thumb drive). The price is still $50 + shipping and handling ($10 listed but I would guess that is for the USA?)). Minor correction for Steve (who has way more miles in a T than I do. (I may have more parked time in a T than Steve as I lived/played in one for years before I was old enough to drive it?). (I was surprised that Bruce's hard copy book "Model T Ford" does not have that "serial number stamped on the frame" information listed for Dec 1925 on page 568. But it is listed in the on-line encyclopedia and also on my copy of the CD version as Dec 12 and not Dec 10. If your version of the CD has Dec 10, please let me know as I would like to find out which one is more accurate. From the on-line encyclopedia at:
https://www.mtfca.com/model_t_encyclopedia/doc25/ it has:
DEC 12 Acc. 94. Walter Fishleigh files, Ford Archives “Motor number was first placed on frame side member R.H. on Dec. 12, 1925. Motor No. 12,861,044. Information obtained from Mr. Burns, Final Assy., Highland Park.”
The updated format on the website has consolidated some information and I suspect for most folks it works great/contains more of what they want. I also suspect they have made if more friendly for display on tablets and phones -- but I haven't gotten that modern yet.
The older version is still out there. I like to search that using Google i.e. type in what I want in Google and add site:mtfca.com and it often finds it for me. I'm also used to finding stuff there. In your case your 1925 hunch is correct. So you could go to the old format by going to:
https://www.mtfca.com/encyclopedia/
Then scroll down to banner that says "GO TO THE OLD VERSION OF THE ENCYCLOPEDIA"
From there I go to "For a chronological list of changes in the Model T..." and click on 1925 (because I thought it was around there. If I didn't find it there I would look a year or so either side).
You can also find it on the updated format. Scroll past the "GO TO THE OLD VERSION OF THE ENCYCLOPEDIA" and go down to
And again, scroll down to 1925 since we think it is near there. I have sometimes gone from 1909 to 1927 only to find out I missed what I was looking for or it was some place else.
And yes, Bruce's book is most accurate for the USA produced Model Ts. In large part, because a lot of that information was/is still available at the Benson Ford Archives. And he was specifically looking for USA information to publish in "The Vintage Ford" when he was the editor. He also did some other nations -- but had to rely on submissions from others. Also many records in Europe were destroyed during WWII.
Note that once all of the major engine production was shifted from the USA Highland Park Plant to the USA River Rouge plant, all engines assembled at the River Rouge plant were shipped to the Highland Park Plant for assembly into the cars and trucks. In this case the serial number 12,861,044 listed above was stamped on the engine block on Dec 5, 1925 (ref engine serial numbers page 533 Bruce's book) but was then shipped to the Highland Park Plant (not very far away). But it was not put into the car chassis until Dec 12 (approximately 7 days later). So the number stamped on the frame is actually stamped a little (or maybe a lot) later than when the engine is stamped. In the case of the 15,000,000 Model T they pulled engine assemblies 14,999,999 to 15,000,001 on May 25, 1927 and those only took a day to make it to the Highland Park plant where car #15,000,000 rolled off the assembly line on May 26, 1927.
And in the case of overseas assembly -- depending on where the engine was assembled, with the exception of Canada starting in 1913 -- all other assembly plants used blocks of engine serial numbers provided by Ford USA. For example on May 24, 1927 4000 serial numbers (not engines but serial numbers to be stamped on the engine that were assembled later) were sent to Manchester UK (ref page 536 Bruce McCalley, "Model T Ford.").
Obviously I like this kind of stuff. And I'm hoping to retire in less than 2 more years, move to Richmond, IN and be able to do more research at the MTFCA Museum Library as well as more actual working on my old cars. If anyone else is interested in helping us continue to update the information on the 1903-1927ish Fords -- please drop me a note or post one on line. If you don't see a response from me -- please send me an e-mail/private message. As no one I know can check all of the different posting etc. all the time. And I need to keep my day job to help pay for the move.....
Respectfully submitted,
Hap l9l5 cut off