This is a small booklet was put out by the Bulova Watch Company, Inc. in 1950. On the title page is written 'The Functioning, Disassembly and Asembly of Bulova Self-Winding Watches with Self-Winding Parts Index and Illustrations'. The Table of Contents mentions the following calibers: 11AAC, 9AB, 10AU, 10AUC, 9AS, 9ASC and 10BRC. It has 31 pages in all with lots of great illustrations. If you work on Bulova Automatic watches or plan to, you will want this booklet. It measures 5" x 7" and has a plastic comb binding. The pages are in excellent shape with one pen mark on page 18. The front cover has creasing and minor soiling.