Cello Bow ID - worth restoring?

[Kleppi]

I wanted to ask about your opinion on this bow. After trying it out last year I decided to buy it as a secondary bow, knowing that it’s rather a nice players bow than something of substantial value, also considering that the frog and/or button might not be original to the bow. It does feel and play great for my needs as an orchestra professional, but I‘m still wondering, who might have made it and if it’s even worth insuring/certifying? 
It was sold to me as an original Pfretzschner (we can rule out that one quickly, right?), but one of the well known bow experts from Germany was thinking of Markneukirchen around 1890 while another one was almost sure it a 1960s/70s Renz or Penzel - pretty odd right? The only thing they were agreeing on was the incredibly beautiful pernambuco and the well made stick. 

Any ideas? 

Edited September 12, 2024 by Kleppi

[Kleppi]

@martin swan, @Gennady Filimonov 

maybe you got any idea? If needed I can also provide fotos from other angles/parts.

Another question would be if it’s worth restoring the frog and replace the non original button (nickel silver ring is broken) with something else? 
 

Edited September 12, 2024 by Kleppi