The serial # dates it to 1984.I was wondering about the date for my Model 24-2. S/N is AEL13XX
That said, it must be a -3 as the -2 ran from 1961 to 1967.
You likely have an example of the 24-3 that was part of a special 5000 gun run for Lew Horton distributors. It had a 3" barrel (measured from the face of the cylinder forward), round butt and wood fingergrooved combat grips.
Jim