...mentioned by Bolek are the engravings on a satin gold-plate Buescher True-Tone baritone sax.

A gold sax cost about double the standard finish back then (satin silver plate with gold plate inside the bell). First the bell had to be engraved, the engravings masked off and the sax body sandblasted to a satin finish. It was then silver plated, and 21k coin-gold plated over the silver. The inner areas of the engravings were smoothed bright with a burnishing tool, creating the eye catching contrasting look so well depicted in the photo.

Finally, bright gold keys with all necessary pads, springs, and corks were installed. A resident musician playtested every Buescher before it left the plant.

All this for a barisax with range only to top E flat - which would be obsolete in just a few years, when instruments with high E and F keys began to become available!

Yeah, pretty much. Below is a chunk of a 1992 Selmer Baritone. What's NOT so much a thing anymore is the curved soprano that's sitting in front. Very unusual nowadays. Jan Garbarek still plays one far as I know. Gives a different tone from the straight version, which is way more popular. For example (gulp), Kenny G.

Is this still a thing? I've never seen that before. Fabulous!

It's a Boehm system clarinet (minus the low E-flat key), which is still the standard today in most places. The Oehler system is supposed to be more popular with professional clarinetists in Germany and Austria. Both the Boehm and the Oehler systems superseded the Albert system, although Albert system clarinets are still popular for some kinds of music (I associate Albert clarinets with Central and Eastern Europe and with music from those areas, such as klezmer).

There's several important early jazz musicians here: Joe Tarto is the bassist, Chauncey Morehouse is on drums and Arthur Schutt is on piano. Schutt was a true virtuoso. All prominent on record, sadly they are now known only to those interested in the jazz/dance music of the period.

Here's how they sounded:

One of their recordings: https://youtu.be/pstM687ohOQ

The saxophone family is well represented here. From lowest to highest: baritone, tenor, C melody, alto (2), straight soprano, and either a curved soprano or a sopranino. I bet they kept their reed salesman busy!

Find some place where the floor is curved. But don't make it a symmetrical curve.

[I suspect the roof is crowned for drainage. - Dave]

We need to take the trumpet player into custody for pouring booze from his flask.

[That's a tobacco pouch. He's rolling a cigarette. - Dave]

I see the clarinetist only has one instrument with him, probably a common B-flat. Clarinets in A are often specified in orchestral works because they play better in sharp keys. The teensy saxophone is a soprano -- usually today they look like brass clarinets, but the curve here matches up with the other size saxes.

Further clarification on the clarinet -- it's got a really ancient key system on it. In fact it is a Klosé-Boehm system keying from 1839, around four generations behind the modern Oehler system that orchestra players use today, which was developed in 1900. The first black jazz players often bought old obsolete instruments shipped over from Europe so that may be where it came from. Even today some jazz players prefer playing on older key system instruments.