Raving Toy Maniac

My grandmother gave me a set of toy brick for Christmas, about 1960 or 61. Near life sized, studs & indentations to stack well. I still have about 20 some. No one else I knew ever had any or ever heard of them. Did I get some 1 of a kind toy? I rather doubt it. She was not a person of privilege or wealth to get something like that. Set was probably 3-4 dozen when new. No markings at all on the bricks. The box did not survive the 1st year or I might remember something from it. Has anyone else ever seen these? See pic.