Blank face

Or if the neck is set in with a dovetail.

Not necessary to see any pictures. The quintessence of all this exchange are two things one can be sure of if stumbling on a Juzek labelled instrument for sale: !.) It's a Schönbach trade instrument of varying quality, often pre-dated. 2.) It's usually overpriced due to all the misleading marketing propaganda. It's possible to safe a lot of money buying an identical instrument just announced as "Schönbach trade instrument". Ok, this were three things. Never mind.

Probably you need a software/an App to disable the geoblocking with the help of a fake American IP address (nothing what I'm doing usually).

Looks to me more like a crack, with residues of glue. This is a very typical place for such a crack. The actual faceplate has a bad fit, so it's very unlikely that it's original. It has to be replaced anyway due to the damage, so you could look for a nail hole. The wood seems to be pernambuco, the fittings nickel IMO. There were several other Pfretzschner named dealers and makers, so the stamp could be original, just not by the most reknown Heinrich Richard shop.

Doesn't look like a HR Pfretzschner. The small crack at the rearside of the head is often seen at bows which had in the beginning a metal face plate; such cracks are caused by a nail holding this plate.

Now with the new photos the frog appears to be original. Either the eyelet has come out or the stick is planed irregular, especialler at the player side (or both).

The frog looks like it doesn't belong, more like an older (ca. 100 years) German one with a bad fit.

I thought it ended a long time before 1850, but the OP fiddles must have been from the last far cry. This year, when making vacancies in more far away regions was difficult, we had a lot of TV spots about "Fehrrrienn iim Ssaltsskammarrrguut".

I‘d rather assume a ca 1820/30ish date; the older ones were also cheap, but not that nasty.

The London "big money" collectors must have missed this.

Both are most probably from the Austrian Salzkammergut, a short time before the making there was finished by the competition of the even more cheaper Vogtlands in the early 19th century. And yes of course these are often misrepresented as Testoris, sometimes certified as this at auctions.

Hi Guido, the violin looks, generally spoken, like something I would call school or shop of Hamm family. The rounded scroll with the small eye is very typical, also many other features. The workmanship is more roughly than I would expect from a real Hamm. The handwritten label could mean anything, an owner, repairer, could be switched over from something else, or taken from one of the printed label sheets, but in each case insignificant, because the violin surely wasn't made in Gotha and not before the first half of the 19th century.

Another applicable idiom would be "ins Klo greifen".

And they are pointing out that it's not made in China.

Could be. My high school name was "Burned Fingers". I never was in Egypt.