I built this 89 Bat Gadget that is only slightly featured in the film. You can see it on his Weapons Door. Apparently there was a scene that was cut that would have featured it.
I made a Version 2 ... tweaks based on I some better pics that I received. Specifically the butt of the handle. I had thought it was a second, chrome piece. Clearly it's not a separate piece but was a highlight from a curved end.
At one point I actually searched around to find a clicking counter that match the font and style of the rotating numbers on this prop and the bomb. It'd be fun to have an found object incorporated in the two props to connect them.
You can even see on the handset where the fourth number has been covered up, which is weird since a fourth number is present on the original concept sketch. Maybe they had to remove that number wheel because the pointed shape of the prop got too narrow.
nick daring I never notices the little tracer in the drawing. Neat. And I also went down the rabbit hole looking at mechanical counters. Nothing seems to fit the size and proportion needs for either.