The F105-W is what you graduate to after you realize the F-91W is essentially useless is the dark. I've worn both since the early 90s. The band always breaks be

The F105-W is what you graduate to after you realize the F-91W is essentially useless is the dark. I've worn both since the early 90s. The band always breaks before the battery or watch itself dies. But i still get years out of them.