Unknown tool

[Nutiborskoku]

Hi guys,

I buy a lot of old watchmaker's tools and yesterday I got another 15 kg worth of old treasures

There's one that I don't recognize though. It looks like a brass plate and it has circles with numbers in them on both sides.

Does any of you know what this is?

Best,

Melvin

[Nucejoe]

I guesstimate to measure balance wheel OD with.

Edited September 13, 2019 by Nucejoe
And roller OD.

[Nutiborskoku]

31 minutes ago, Nucejoe said:

I guesstimate to measure balance wheel OD with.

Interesting To measure the diameter of the balance wheel and the roller. Could it also be the barrel?

[oldhippy]

It is for Barrels. Here is a photo of the type I had. The top gaps and bottom are for the width of the m/springs.  

[Nutiborskoku]

Very interesting stuff. I think you're right but I find it strange that the plate I have has such small sizes. No way there are barrels that small.

[Nucejoe]

1 hour ago, Nutiborskoku said:

Interesting To measure the diameter of the balance wheel and the roller. Could it also be the barrel?

Would you settle for, barrel, spring thickness and the little holes for arbor? 

Edited September 13, 2019 by Nucejoe
Ok, width ,thickness

[Nutiborskoku]

9 minutes ago, Nucejoe said:

Would you settle for, barrel, spring thickness and the little holes for arbor? 

Yeah that sounds about right  It's a combo tool.

[Nutiborskoku]

Thanks for the answers! I appreciate it.