D21 Serial Number

Can Someone tell me the meaning of the 3 0's in front of this D21 Serial Number? Thank you  The Serial Number is D21 0003199. Please message me if you have any information!

Edited by AllisCD21 - 18 Aug 2020 at 6:03pm

Yes the serial number does start with D21 but what I am wanting to know is why the serial number has 3 0's and then 3199. Again the serial number is D21 0003199. 

Like the Dr. says, but maybe that happened right at the Factory before the new Tractor was ever shipped, and a Back-up Potable Number Stamper was used, which had 7 characters 0 to 9 and no blank digit.

When looking at the serial number on the bell housing, You can tell that D21 and the 3 0's were stamped way before the 3199 and it was factory stamped because D21 and the 0's have paint in the indention and is evenly spaced but when looking at the 3199, it looks like it was not stamped in the factory, the number are almost on top of each other, and there isn't any paint in the indention. 

Do you know of anyone else that might have any information? It is greatly appreciated!

It’s odd that D21 and 3199 stand out more than the 3 000’s?

The D-21 bellhousing was unique. It only fit a D-21. The torque tube to a 180 also fit a 185 and 190 and 190XT, so no chance of pre-stamping a new torque housing. Same for a D-17 and D-19.  So, this may have been a replacement housing pre-stamped...... you finish the exact s/n kind of thing.

MY first thought was maybe it was a prototype's bell housing that got recycled later during production. However, after reading the comments, I would have to agree with the others that it is probably just a regular replacement part bell housing pre-stamped with the extra 0s. It sure would make sense as an easy way to distinguish an extra replacement part bell housing from an original from a factory assembled tractor. This really makes even more sense when you consider that basically from their introduction to the market, tractor pullers were building these monsters up for pulling. How long do you suppose it took for some of them to start busting bell housings????

Does the d21 bell housing fit anything else. That's what it looks like, it was replaced back when allis was still in business and a dealer did the stamping.

Welcome to the forum. Put some more pictures of tractor. What other allis stuff do you have. Hope you stick around and join in.

I said D-21 bell housing was unique to the D-21.

      In the process of restoring the D21 in question.

Looks to me like the 3199 has been stamped over another number, I can see something else under the "1"

I would like to see the rest of the tractor also if you have some images. Thanks. Looks possible re-stamp also because looks a little off and last 4 numbers to me are deeper and darker. Just my 2 cemts. Thanks Darryl

   After another inspection the only difference between this tractor and the others is the brake cover plate.   This one has a flat face and the others have a ribbed face.   All casting numbers are the same.  Any ideas?  Thanks,