GeorgeH

Did you get permission from the owner to publish pictures of their bow for comment on a public website?

And you believed that?

Odd one. Seller says "A rare and exquisitely crafted 4/4 full-size violin bow from the world-renowned workshop of H.R. Pfretzschner. This distinctive presentation piece features an engraved ferrule commemorating "120 Jahre" (120 Years), celebrating the workshop's founding anniversary (1880–2000)." I can't find any other bows with a "H.R. Pfretzschner®" brand. Apparently at some point in the 90s there were two H.R. Pfretzschner firms. One in Markneukirchen and one in Bad Endorf, and they seemingly were involved in trademark disputes, but that may or may not be relevant. https://www.ebay.com/itm/800599375882

What other provenance is there? $100k cellos don't just appear out of nowhere.

1. A database of sufficient size and breadth containing standardized, high-resolution interior and exterior photographs and detailed measurements of authenticated antique violins does not currently exist and realistically, could never be assembled on the scale required. Yet such a database would be essential for any AI system capable of reliably assigning antique violins to particular makers. 2. Even if, in theory, an AI system could accurately identify some makers of antique violins, the same digital information and criteria the system used to distinguish authentic instruments could immediately be exploited to produce forgeries engineered to satisfy those criteria thus making them digitally indistinguishable from authentic examples. So proponents of this particular application of AI can dream on, but it ain’t gonna happen. Ever.

And he leaped tall buildings in a single bound.

Makes it even more amazing, don’t you think? From The Strad: https://www.thestrad.com/video/eine-kleine-nachtmusik-for-solo-violin/13253.article And they can’t even blame AI!

He plays a 1695 Giuseppe Guarneri 'del Gesù' violin with a fingerboard that has carved frets.

Yes, he is an outlier even among soloists. And I doubt that Heifetz would have been able to perform some of his arrangements like Kim's Beethoven Symphony No. 5 on a solo violin. (To be fair to Heifetz, I think it would challenge any violinist, past or present.) All of today’s great soloists, including Kim, have studied Heifetz and the other great soloists of the past. I don’t see or hear anything that Heifetz could do that today’s great soloists can’t do and with better intonation. Teaching and teaching tools have evolved greatly in the 40 years since Heifetz died, and consequently so have the technical skills of talented young violinists. Every summer I watch the young performers at the Perlman Music Program summer camp, and some of them are unbelievably technically accomplished at very young ages. And they are only going to get better. As Isaac Newton said, “If I have seen further, it is by standing on the shoulders of Giants.” Heifetz was a giant, of course, and today’s great violinists are standing on his shoulders and “seeing further.” Of course, I know that there are people who insist that Heifetz was the greatest, now and forever, and that to say otherwise is some kind of blasphemy. That’s okay. Many people once believed that the four-minute mile could never be broken.

Have you heard Roman Kim? https://www.thestrad.com/video/the-violin-technique-that-shouldnt-exist-minutephysics-explains-roman-kims-harmonics-technique/20808.article

Even the experts at Tarisio have trouble getting the colors right.

Heifetz was great in his day, but he did not have the modern equipment and environment that today’s players have, like synthetic strings that stay in tune and humidity-controlled concert halls. Plus, just as athletic performances keep breaking records, the athletic skills and training exhibited by modern virtuoso players keep improving and are much higher now than they were in Heifetz’s day. So, just as we can still revere Roger Bannister as the first runner to break the four-minute mile, we also know that modern elite runners are much faster. The current record of 3:42.66 was just set by Josh Kerr on July 18, 2026. Similarly, we can acknowledge Heifetz as one of the greatest violinists of his time while also recognizing that modern virtuoso soloists are playing at a much higher level because athleticism, training, equipment, and climate control have all improved significantly since his day.

Those are manufacturing marks, not Roman numerals as is often assumed.

Here are some pictures of the backwood from the interior, if they might be helpful. The figure is faint, adding credence to Brad and David's observations. I think that I am just going to call it "cut on the slab" as that is what it is.

Here is a larger picture under improved lighting. The violin is an authentic work by a New England maker, c. 1900, so it likely is American wood.