From what I know about Maillard hubs.(not a lot) The 83 will be the year...
You'll find those hubs under all sorts of names - and unmarked too.
Normandy
Spidel
Maillard
Atom
Excelto
Milremo
LeTour
Sachs
to name a few.
I think they were usually known as 'sport' when they came direct from Mailiard, sometimes as 400 or 600 (can't remember which). They would polish up to a nice bright satin sheen but weren't a touch on the almost mirror finish of the 700 series hubs as supplied.