The embossing is OTIS' placed above the center crease line. Thanks to Robin Harrison this square body is now in my LRI collection. To my knowledge four different embossing styles of Square Body Otis's exist:

1. Unembossed 2. Otis over center crease line 3. Otis under center crease line 4. Horizontal embossing

Anyone have different kinds of "Square Bodies" drop me a line. Thanks for looking!