This is an original 1947 Simplex Piston Rings Catalog.  Front page states it is a tempory catalog but when the front inside page is read it shows that this is a compilation of all the previous catalogs so information is complete and up to date and easier to read.  Great reference catalog and also to help identify any of those old obsolete parts. This has 30 pages and is in very good condition with some spots on the cover please see photos as this is part of the description.