French Frog ID

[Guido]

Fished a lovely French frog out of my parts box today.

Hoping for a school ID or maybe even some candidate names.

One feature that stands out for me is that the button is screwed on the screw (rather than the common press fit on a square taper).

The underslide has one pin behind the eyelet. The pin is either huge (!) or has a flat head. Seems to have some sharpie pen marks on the underslide, never mind.

[martin swan]

Why french?

[Brad Dorsey]

3 hours ago, Guido said:

...The pin is either huge (!) or has a flat head...

Could it be a screw with its head filed down far enough to file away the slot?

[Guido]

16 hours ago, Brad Dorsey said:

Could it be a screw with its head filed down far enough to file away the slot?

I'm aware of this having been done and have seen it before. I don't think that's the case here; but can't be sure.

[Guido]

Has anyone ever seen a button screwed to the screw?

I have read about it in John Staggs repair book, but this is the first one I see in real life. And Stagg didn't elaborate on where/ when this variation of button attachment can be found.

[Blank face]

2 hours ago, Guido said:

Has anyone ever seen a button screwed to the screw?

I have read about it in John Staggs repair book, but this is the first one I see in real life. And Stagg didn't elaborate on where/ when this variation of button attachment can be found.

I've sen this at ca. late 19th century German bow adjusters (and that's what I'm assuming the OP is, too).

[fiddlecollector]

The screwed in button started probably with FX Tourte and NL Tourte   along time ago.

[Brad Dorsey]

7 hours ago, Guido said:

Has anyone ever seen a button screwed to the screw?...

I see them occasionally.