This is a vintage "WARNING - DEATH MAY OCCUR IF TANK IS ENTERED WITHOUT PROPER EQUIPMENT" Sign from the early 1970's. It was posted for a short time, using adhesive, and has been in storage, away from sunlight and handling ever since. The original holes, drilled in each corner for use in posting the sign have never been used. This sign measures 6" wide x 4" tall. It has a red background, and the warning is printed in large white capital letters across the face. Please see all photos for the best description of this old sign. Note: the white circle that shows on the back of the sign is "camera glare" from an overhead light - and not part of the sign. Most any vintage sign collector, or anyone who needs this message today will likely be pleased with this item.