Larry, I thought you may enjoy a few photos, relevant to your post and of similar things you seem to enjoy !
Here is a completely original Jackson M-11 wheelbarrow with a folded tray, even the old cracked tire is a "Jackmanco". You can barely read the logo on the right side in this photo, it says "Jackmanco" Reg. U.S. Pat. Off. Apparently, another great product of the period from PA.
I got it off CL, for $30, from a man who was moving, and it was his dads, whom used it when he built his homes and similar work, boy you can tell by the bottom of the tray. I have another one of these identical, same era or age, same price, neither seemed to have spent a night outside, but you can tell the one in the photo has seen a lot of work. The other one, was another mans fathers, he said he recalls riding in it as a kid in the 50's. The rear legs on both are made of small bent C-channel, not stamped, though I think the modern version is fine regardless, as the tray and handles are what count. These products certainly reflect an era of quality and durability.
I have seen new wood parts available for these, as well as the folded or stamped trays. It seems a new Jackson with a folded tray is available, comparable to the old ones like these and are reasonable.
I do not see these old ones listed often, I may have seen one other, besides the 2 I bought, must be the years go by, and many not kept inside, as I cannot see otherwise how any of these would not make it 50+ years, even when worked hard daily.
I really like this style for firewood, I put stakes along the wood and can stack double the height of the sides and fit it through a narrow path, (that is if I can lift the darned thing LOL!)
I know its really exciting stuff, these old wheelbarrows, with all their history, so I'll throw in some twilight tillage and shots of the black gold I make from the used bedding of my little garage mascots, they do have a purpose and the photo is the pay off, 10 loads of black gold, just about broken down, should be nice soil this spring.