1962 Dodge Lancer

Mine is 776 also. How did you determine the build date? On my fender tag I have an A3, L1 and Q5, 635 Trim and WW1 Paint.
I may be wrong referring to it as build date.
The 4 numbers in the bottom left are Shipping Order # Planned delivery date. Month/Date
Mine is 05 (May) 23 (Date).
Do you know what the numbers are under the 1-0 and the alphabet are.