* Clarinet
CONN USA. Just correcting your spelling mistake.
For the Conn, look to see if there is an "L", "LP", "H", or "HP" marking. The 424N clarinets were made around the late 1930s and early 1940s. Conn used to make both HIGH PITCH (that's your H or HP) and LOW PITCH (that's your L or LP) instruments. Making a longer conversation shorter, HP woodwinds can't be played in tune or be made to play in tune with modern instruments, which means that, in most cases, HP instruments are obsolete and worth $0. Again, in most cases. It's also possible that the 424N was only made in LP, which would be great!
The clarinet was a pro model. I've not personally played one, so I have no idea how it plays vs. other modern horns. Pricing, for a restored instrument,
looks all over the map. A restored horn is probably in that $500 range, max, not that $22,000 range that a couple ebay sellers are dreaming of, but you can do more research to determine that.
* Clarinet Noblet Paris snr A2971
Noblet was Leblanc's intermediate line.
The stamp on the horn looks to me very much like the
Noblet 27 stamp, but it's not identical. Also, the left hand keywork on the bottom joint -- in your picture, it's the part on the right -- looks different than the Noblet 27. Serial number maps to 1971, which would mean either a
Noblet 40 or 45 model, but those don't look like your horn, either.
@Steve will be able to help out more than me, if he's available. I'd strongly recommend not trying to sell this until you get some more information.
* Trombone AR Hüttl W. Germany Line800 snr 4089
AR Hüttl is the grandson of AK Hüttl. Only thing I can tell you about the serial number, after doing a bit of Googling, is "after 1954 to around 1990".
As far as I can tell from Line 800 trumpet prices ($350 or less), this was probably a student model trombone. I'd recommend asking on a real brass forum.
https://horn-u-copia.net has been good to me.
* Trumpet Yamaha YTR 2320E snr 209324
->Student model. Yamaha's model numbers are pretty consistent across all the instruments they sell. A model number starting with "2" is a student instrument. The "E" means it was sold in the European market.
-> Dates for Yamaha serial numbers can only be determined by Yamaha, as they're not consecutive and I know of no Yamaha serial number lists online. However,
this says the model was discontinued in 1997.
->ebay closed ads hover around $250 in great shape.
* King Modell2 snr 10297
This is a Julius Keilwerth-made Bb tenor saxophone that was produced in 1937. Probably nickel plated. "King" is the model name and "Modell 2" refers one of the options you could get for the horn. If you prefer another analogy, it's like the trim level on your car. In this case, you've got the tunable neck, which is nice.
@Helen is our resident German and Czech saxophone specialist, so it's her time to shine in this thread!
I think the neck is broken. That's the thing that the mouthpiece is on or, if you prefer, it's the part that's not connected to the body of the horn in your picture. It might just be the angle in your picture confusing me. I'm not positive.
If the horn was in good shape, it'd probably be worth in the $700 to $1000 range. It wasn't Keilwerth's highest-end model, at the time.
*** Note that the mouthpieces for all the instruments can have additional value. It's possible that the mouthpieces can be worth
considerably more than the horns. You might want to post some bigger and better pictures.
*** We've got a few repair techs on this forum, so if you want to post bigger and better pictures -- and more of them -- they might be able to give you an idea of what needs to be repaired or replaced.