Ophiuchus
166
Easy.
It's a "counting tool", for vibrating hairsprings. It is a tool for determining the correct pinning point of a hairspring at the stud, using a master oscillator balance.
Do I win anything? I'll take a Moser Mayu Fume 
A Little Game for the Weekend
Anyone care to have a guess at what is hiding within the box? Hint, it is vintage and inspired by spring......
I am guessing it is....
The tool that Monique used to regulate balance wheels... Am I close?
A clue
Sorry, I should have asked for the name it is known by, otherwise I fear that I'll have to guess your meaning. My wife calls it a "thingamabob"... Here is a further clue: ...
Easy.
It's a "counting tool", for vibrating hairsprings. It is a tool for determining the correct pinning point of a hairspring at the stud, using a master oscillator balance. Do I win anything? I'll take a Moser Mayu Fume :)
And we have a winner!
"Easy", he says ;-) Your prize is the esteem of fellow Purists!
A balance-spring vibrating tool
otherwise known as a vibrator...but don't Google that! I was inspired by our visit to Montblanc Minerva and the demonstration by one of their two in-house Poseuse de spiraux (often, although incorrectly, called a régleuse as the female form of régleur; so...
Nice one Dean!
I never grow tired of watching the Montblanc Villeret youtube videos especially the part where Monique regulates the spring. I would love to visit their manufacture one day when I can travel more... 3 young kids plus lots of business travels are making it...
I hear ya Robin
Life tends to get in the way at times, but sounds like you have family as your No. 1 priority :-) I believe we will target Watch & Wonders for 2014.