A gent put this on ebay, and I had to bite. This is the only other one I've seen that you can even find a picture of. All of the timer clocks were specialty orders, but this one was likely one of the more expensive variants. It weighs 116 grams. If you ordered just the clock and one module it is 65 grams and each additional module ordered is 25 grams. This clock has 3 modules. Each module has fins with wire contact points for hours, minutes, and seconds based on the number of holes. The seller got it at an estate auction and the gent's name didn't pull up anything important. The tag says it came from the Naval Ordnance Laboratory which closed down in the early 90s. The seller and the estate were in Maryland, so I believe the swing tag is true, especially since Bulova made instrument clocks and trigger timer switches for every military ordnance department. This timer clock was never installed in anything since there is no residual solder on any of the contact points. I also made a little case for it so I can protect the fins.