Swartchild & Co Chart Book for American Balance Staffs - reprint

Swartchild & Co. "CHART BOOK For Genuine AMERICAN BALANCE STAFFS" guide from sometime in the 1940's with this being a reprint. Catalog is 8 1/2 x 11 and is 15 pages long. Condition is good but it does have some streaks on the cover. This is a guide designed for people who use the Swartchild Build-Up system but I've found that it makes a great companion piece to the George Townsend's Staff Interchangeable Guide. There's also a unique American staff & jewel interchangeability list on page 1. Images do a pretty good job of representing the item.