This neat book is in very good condition with some wear and use evident. The book has the name of the USS Chalcedony PYC-16 on the front cover top in pencil. The Chalcedony was a Patrol Yacht Coastal during World War II. This may or may not have been used on that vessel. The book is for the dates January to April 1945 and contains outlines of the American planes in use at that time.