Theo

Read Theo's response again, and be aware that he is writing from his experience as an established concertina and accordion restorer and dealer. What it's worth is what someone is willing to pay for it. Yes, and size and number of buttons is not really relevant. The value of 30 key (anglo) is supported by a huge international market of people who play Irish music. To take an opposite example: you could compare the vale of a 120 bass piano accordion from the 1930s (which is when your Scheffler was likely made) which has more buttons and keys. These can have highly ornate inlay work and be of similar build similar quality to the Scheffler. Even in playable condition these are virtually unsaleable and their value is mostly just for use as spare parts.

Yes and no, but mainly no. The cost to build a new one would be much much higher, probably a few thousand, but the value of it now is as much as someone is willing to pay. As far as I can understand it is an obscure variant of a class of concertina than is played in a few niche genres. My guess is if you really want to sell it you might need to lower your expectations. A practical suggestion is to search eBay for completed sales, see what price similar instruments have sold for.

Steve’s advice above is absolutely spot on. Using superglue (or any other glue) alone is definitely second best.

Classical music is also possible on the anglo. https://livestream.com/uol/final-recitals-17/videos/157705262 from about 5:30

I came across G H Leather recently. I haven't tried contacting them yet.

I think I’ll find this very useful for describing instruments for sale. Would you like use elsewhere to be credited?

The Reverb listing says USA. It's a nice find, some of Lachenals best anglos were around this number of buttons. The crosshead screws in the action boards show that it's had work done on it much more recently than 1913!

I have one that seems to be from the same family but in this case a large size 37 key tenor New Model.

Strictly speaking this is not a German made anglo, it is just a German concertina. The anglo was based on the German note layout but using English construction methods, hence the name Anglo-German which has become contracted to "Anglo"

As a temporary fix you can get a valve a bit flatter by gently stroking the surface with the flat blade of a screwdriver or similar tool. It slightly stretches the top surface which can straighten out a curved valve. Useful as a quick fix in the field, but may curl again soon.

sold elsewhere

Are you sure there is air leaking through this gap? If there is then the note would be very difficult or even impossible to play. An easy way to test is to cover the hole completely with stick tape and see if that makes a significant difference.

Hohner International branded 48 key English concertina, probably made for Hohner by Bastari (the predecessor of Stagi) in Italy. This is potentially a nice starter English concertina, but needs some work to get it playing well. The accordion type reeds are steel on aluminium plates and arranged with folding wings on each side (see photos) to fit in all the reeds and keep the instrument compact. All reeds work, some are out of tune, and many have noisy valves, so it will need valves replaced and tuning. Bellows look good with very little sign of wear. Most of the washers from the end bolts are lost and need to be replaced. The bolts are M3 so new matching washers should be easy to find. It comes in a Hohner branded box which I assume it was sold with from new. Woodwork on the right side has suffered some trauma near the Hohner name – see photo. The white marks on the first two photos are just reflections. Price £120 including UK delivery Donation to c.net if sold here so please let me know that you found this advert.

Pressed felt doesn't wear as well as woven felt. It has been used by at least one melodeon manufacturer to bush bass buttons. I've had to replace these quite often on instruments that are not that old. Busing concertina buttons is a somewhat tedious job, you don't want to have to replace them every decade or two! I think pressed felt is also generally softer than woven felt so concertina buttons might have more sideways movement, which is not conducive to good playing. Using 2mm felt compressed to 1mm would be more stable, but how do you stop the felt expanding back to its original size and making the buttons tight. Much better to just use the correct material in the first place.

Microvox concertina mics and power supply for sale, used of course, these have been out of production for a while. The setup consists of two electret mics permanently wired into a box that provides power from a pp3 battery and combines the two mic signals and outputs via a jack socket. The mics are fastened to the instrument with velcro, and there is spare velcro included. There is also a padded storage case that holds the mics and power supply. Price £60 including UK postage.