The chances that someone would actually need this exact model are pretty much zero, as far as I can think of. This diving computer is a "spare" in our family, as me and my wife are running more advanced ones. But the kids grow and can use one soon, hopefully, and the original rubber boot of these simple types is very prone to degrading and falling apart in our climate.

So I've measured and made a TPU replacement that attaches to a regular 24mm watch wristband using 2.4-mm wide stainless steel rod for attaching the wristbands. And someone else might be able to use this as a basis to adjust for something else, so I'm including the Blender file as well.

If you happen to print it - TPU settings to your liking, but please set supports to "on" for 60 degrees and above. This will guarantee proper printing of the wristband openings.