That's a tough one.
As you said, a guy doesn't see them often enough to have much to measure by.
No Ford style weights are going down in price though.
Asking price for pie weights is approaching $.80 to even $.90/lb.
Front wheel weights getting close to that too.
Front bumper weights I'd guess are More than $1/lb.
Run of the mill rear wheel weights, of which there are several types are at least $.60-$.75/lb.
I would guess your axle weights fall in that $.60-$.70 price range too.
I kinda have a cast iron weight fetish.
Have owned a number of them over the years but never a set of those axle weights.
What do yours weigh?
I think the ultimate Ford weights would be a set of fender weights. They are shaped like a fender but made of cast iron. Maybe 500? lbs each.
I just cleaned up and brush primed these "Pillow" weights last week.
Working on another mid 1960s Ford here and will put these on it when I get the tractor done.