It was all metal and came with lots of little screws/bolts and nuts to hold every thing together.
It had flat metal pieces that was 3/4 inch wide and came in many lengths, 2 holes long to 20 holes long.
And other pieces, that were like panels with lots of holes space out about 3/4 inch apart so you could bolt these all together into different shapes.
I think this was one of the first new toy I got, most of the time I would get used or repair toys, and that was okay, because I did not care if was new or old, just as long as I could call it my toy.
My old Erector set was just that is was called the "Erector Set" this one in the picture is a 725 kit that my Mom found and put in a case with lots of pieces.
My old set I had, last time I saw it, was in a little metal box that it came with and some how it had gotton water in it, so it had pretty much rusted away.
I don't think that the, laws would allow kids to play with a toy of the type, today.
The screws and nut and some of the other pieces would really cause choking problems.
And most of the metal parts were galvanized or chromed, with lots of sharp edges and pointy thing, and the galvanizing can't be good to put into you mouth, and touching all the time.
I had other build type toys, but, this one I must have spent days playing and building.
Found the old set in the attic of the shop, must have went up there when Mom past away.
I did build something, and the screws and nuts seem a lot smaller then I remember or my hands and fingers were much smaller back in 1963, so that could be it.
I would build army tanks, radar station, cars and lots of other item, most what I would see traveling.