Ron,
all 28's are rare in this country.... thought hard tops seem to have survived better, and all green ones, don't know what it is but 95% of the 28's have been painted green. If you saw a soft top Graham at Bendigo it more than likely would have been us (Two tone green and wire wheels). There is the remains of a Graham in camperdown (So bad we left it there...), maybe your old stalwell car..
As for dodge, they never were involved in Graham paige, the Graham bros made Dodge truck under license till about 24-25, then sold the business back to dodge. With the money from that they purchase the paige car company. in 1930 they dropped the paige name. Post WW2 they became Kaiser-Fraser. The Co is still around, it owns Madison Square Gardens.
Better shut up now or I could go on all night..
PS.. Tonto, my father had a MK 5 sedan when I was growing up, it is one of the reasons I own a jag now. The purchase list went Mk5, Riley RM, XJ6