Casio F-91W
Hueytown Engine 1. First due in Hueytown, Alabama, "on my first structure with the ole reliable Casio." "I have many Casios and they have been through hell and all withstood everything I put them through, but a house fire was a new test, and here she is still ticking." All occupants were safe, and this picture was taken once the job was done. On the wrist, a Casio F-91W. Do you remember what was on your wrist at your first structure fire? If you have a wrist shot from somewhere that matters, submit at the link in bio. Tempus Est Potentia.
Intel Report
Casio F-91W
The F-91W went on sale in June 1989 as the successor to the F-87W, and it was the first design Ryusuke Moriai did for Casio. It has barely changed since.
The numbers are small on purpose. The case measures 38.2 by 35.2 by 8.5mm and the whole watch weighs about 21 grams. Inside is Casio's Module 593, powered by a single CR2016 lithium cell rated for about seven years, with accuracy listed at plus or minus 30 seconds a month. It carries a daily alarm, an hourly time signal and a stopwatch that counts to 59:59.99 in hundredths of a second, with split times.
Casio rates it water resistant for everyday splashes and rain, not for swimming.