Stuart you might be surprised at how much those 4 wrenches are going for these days.
Check out wrenching news for a better idea of prices with an eye out for #50 & #52.
To the op if you plan on keeping them be sure and put some oil on a rag and wipe them down at least one time per year. Take very good care of them so the next generation can appreciate them.
I've always heard them refered to as "plow wrenches". I was told that they came with implements to adjust them out in the fields. They aren't much good for anything but decorations now, at least thats the only use I've found for them.
They might not be worth a fortune, but they have a definite "cool" factor to them. Maybe look into getting them chromed or copper plated and use them for a display behind glass.
Thread resurrection. Bumping this thread because I found the Web Site useful. I was looking for information on emblems on elderly tools. I hadn't seen it on GJ prior to this. Kevin54 and Woody 73 mention it here. Woody references it in many other posts. I don't know how I missed it, but ....