Med Stanlo
Stanlo3
Stanley tools made metal toys back in the 30’s – It would be great to see them re-release these… From Popular Science 1933 –

Automobiles, houses, trolley cars, boats, bridges, forts, steam shovels, factories, doll furniture and hundreds of other things–build them with STANLO. And best of all, every piece in a STANLO set is finished in brilliant colors so that you can obtain almost any color combination. • An entirely new principle is used in fastening the pieces together and the finished project is absolutely rigid. There are no nuts or bolts to lose. • A 24 page Instruction Book comes with each STANLO set. It shows over 125 different things to make and suggests many others.

Modern Mechanix » STANLO: THE NEW METAL CONSTRUCTION TOY – Link.

Related:
Check out the building guides, these are great! – Link.