I believe it came in two styles, A & B, and both were a Multi-Focus lens. The "A" was designed as a soft focus portrait lens, while the "B" was for groups, portraits, full figures, etc. The No. 4 (9.5 inch) covered 6x8, No. 5 (12 inch) covered 8x10, No. 6 (14 inch) covered 10x12, and No. 7 (18 inch) covered 11x14. You might also research the catalogues which Camera Eccentric (Seth) has posted for more accurate information.
http://www.cameraeccentric.com/index.html
I personally have never used this lens, but have heard nothing but glowing praise for it. Best wishes, Jon