6904-415 Quick adjusting "Lightning" wrench. Manufactured by the HAMPTON MACHINERY & TOOL CO., with a sliding jaw locked with a spring-operated button. We've seen other examples marked "patent applied for" but have never located a patent. 9-1/2" long, mark a little faint but legible. An uncommon wrench. From the collection of Cecil Holmes. Good+ (CHS209) 50 - 100