The second part of the tag number on a Delco starter with a seven-digit part number is a "date code" indicating the year of the decade, month,and day it was made.
GOOGLE "Delco starter date codes", a lot of the results will be GM car restoration sites, but, no matter the same date code system was used on your tractor starter.
"Serial Numbers and Date Codes found on Delco-Remy parts: Originally the parts were given a serial number in numerical order. These numbers are usually on the older part numbers that were three to four numbers and a letter. Later when DR went to seven digit numerical only part numbers an actual date code was instituted on the oval DR ID tags. The first number is the year, followed by a letter representing the month, and the last number was the day of the month. According to Ted Vinson the tags cost about $0.10 a piece back in the 1950s. The numbers were originally stamped on but later rolled for cost reduction.
A date code of: 3B22 would have been built in the third year of the decade (this has to be figured from the year vehicle it is on), and February 22nd. Below are the monthly codes which did not use "i" as it looks like a 1.
Jan - A, Feb- B, Mar - C, Apr - D, May -E, Jun -F, Jul - G, Aug - H, Sep - J, Oct - K, Nov - L, Dec - M.
Also the tags were colored coded for voltage: Black for 6 Volt, Red for 12 Volt, Green for 24 Volt, and possibly yellow or orange for 32 Volt."
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