Featured I have never ever ever ever seen a mini stopwatch like this one

Hello good people,

Okay, so this truly a mystery for me...

First of all, it is a really small but really well built and heavy for its size...
Second, I have never ever seen a mechanism like this on any watch, stopwatch, chronograph...and I have seen a lot

Third, I have never seen markings on a stopwatch (maybe on some chronograph but with different meaning) like 10/100000...10/10000...10/1000...I think I have never seen a stopwatch with three small dials either (plus the main one)...except maybe one Junghans but it is rather completely different

Forth, The only markings is that on the main dial that says "Germany"...other than that I couldn't find any markings (I have a theory that underneath the mechanism seen on the back is another mechanism that has markings...but I will not test that)

Forth, I know that once again I will possible be completely off but I had an idea...in some moment...that it is connected to WWII and torpedoes...but then I googled and realized that it probably doesn't...however part about WWII still seems right...so I am here...

PLEASE HELP the "not knowing" is killing me

Here it is...Hope you all enjoy it

 

Timing in meters to source of report

 

Bravo Bravo Bravo...It is a pedometer...and I am an idiot

 

Highly doubtful...