I may be able to help you. I own a couple of Ferguson plows, cultivators, dirt scoops and tractor (TO 30) Done quite a bit of research on Harry and his plows. The numbers you are reading are actually 16AO28.
The smooth rolling rear wheel was from 1939-1941 then they were held on with 4 rivets from 1942 on along with a different arm with a spring and pins for down pressure. The cast A frame for the top link was from 1939-1942. The Ford script in the right beam was from 1941 to 1942. 1939-1943 plows had the ID plate on the cross frame on the back of the plow, from 1944-1947 it was on the steel upright strap from the frame to the top link connection. For 1943 the cross shaft u bolt clamp was changed to a steel plate on the outside of the beam instead of the u bolt going through the beam.
The 1st Ferguson 14" plows were model 14A from 1939-1942, from 1943-1947 they were model 14AO-28 or 14AO-40, they are very common because almost every farmer needed a plow for with his new 9N tractor and over 300,000 tractors were made during this time.
From 1939-1942 the ID plate said FERGUSON/SHERMAN Dearborn MI, from 1943 to about 1944 the plate said FERGUSON Harry Ferguson Inc Dearborn, MI, from about 1945-1947 the plate said FERGUSON Harry Ferguson Inc Detroit, MI
If you can read the tag well enough to know what the prefixes mean after the number, the first prefix is type of share
A= general purpose, B= sod or clay, E= slat
F= blackland, H= scotch, I= chilled, K= corn belt, R= general purpose, S= stubble, and second prefix is type of metal
A= cast steel, B= forged steel, C= chilled iron, D= soft center, E= carburized
So, for a Ferguson AO moldboard plow, a 14 AD-AO-130 would be a general purpose, soft center share.
Should you ever need a part for the plow, give these people a call:
Ky-Tenn Tractor Parts #1-800-459-8366 /forums/images/graemlins/grin.gif