Model BI Serial numbers
Here are a few of the interesting BI serial number facts. I have a NEARLY complete listing of all made, if you need something checked, email me at moparwhs@hotmail.com
BI Serial Numbers (same as BR)
Tag Location: Left side of crankcase, by Flywheel, near top, or underneath magneto on electric start tractors
Year Beginning S/N Ending S/N
1936 325000 326654
1937 326655 328110
1938 328111 328999
1939 329000 330632
1940 330633 332038
1941 332039 332426

Total BI production-183 tractors built
Experimental (rebuilt from BR) 325617, and 325686

First (regular production)-326016 built 4/1/36
Last-332157 built 2/25/41

The above information is from Green Magazine
On the BI, the model year/serial numbers are:
1936 325212-326554 - 66 built
1937 326555-328110 - 43 built
1938 328111-328890 (328891-328999 not used) - 35 built
1939 329000-330212 - 6 built
1940 330213-331851 - 19 built
1941 331852-332264 - 11 built

A total of 180 were built, although 183 were actually built; two were rebuilt into 'BR' tractors and one was shipped to Yakima, WA to be built into a crawler. This unique crawler was #330986, and it has BEEN FOUND already. It's no use looking!

The small engine (149 Cu. in.) were from 325000-328999. First one was 325617, built 2/4/36, shipped 2/18/36 to Pittsburgh, PA, noted as being returned and shipped interfactory on 1/2/38. Notes indicate "experimental". Last one was 328899, built 6/14/38, shipped 4/8/39 to Worth, IL.

The big engine (175 cu. in.) models were 329000 and up. First one was 329083, built 6/16/38, shipped 10/26/38 to Minneapolis Sales Branch. Last one was 332157, built 2/25/41, shipped 3/6/41 to Dallas, TX.

The above is an email I recieved on the subject of serial numbers.

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The surviving BIs...here
My email:moparwhs@hotmail.com