Bland Charnas 3900 Clown

Here's a cool boxed costume (missing the mask, sadly) by a company I've never heard of before, Bland Charnas.

Not sure what year this is. The U.S. flammable fabrics act mentioned on the box was passed in 1953, however, Bland Charnas published a catalog called "All Your Halloween Needs for the 70's", published in 1973, so that narrows it down quite a bit.