Hi Dwight,
Thanks for the response.
Your sideplate is interesting. I can't believe the 5 represents the last digit of the serial number. As Bill said above, sideplates observed are a variation of the first two digits (sn, or sn +1 or sn -1) or may be blank.
Your sideplate appears to be the blank variety with the 5 being some extraneous code similar to my 3 and Sidharta's 2.
The plot thickens!
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