Takayuki YAGI

I checked inside again and realized that the number looked like 155262 rather than 155862 (please see the photo). It was 30 key in Ab/Eb retuned to G/D, wood fretwork, steel reeds, 6-fold replacement bellows. This concertina was also discussed here. Sorry for the mistake. I hope this helps. YAGI ?

I do. Mine is 155862 .

I also have Lachenal A flat/ E flat (but retuned to G/D) wood end model. It has additional metal parts with screw-hole under the LHS hand strap which accommodates band lyre. YAGI ?

I thought of that. The English model named Busker and Duet model named Troubadour (not yet available?), all of them are kind of travel poets/musicians. YAGI ?

Just FYI International Concertina Association (ICA) has a list of teachers here. Is Liskeard Cornwall near you ? YAGI ?

Slightly off topic, Barleycorn now lists 22 key Lachenal C/G which has G#/Bb on the LHS and C#/D# on the RHS. YAGI ?

I have no idea but I suppose @Dowright can provide approximate date from the serial number. YAGI ?

According to this page and some older threads, there were some B/F#s by various makes in the past. Its not a common key though. My opinion to the OP is that leave it in the original key. I have re-tuned G/D (from Ab/Eb) and enjoy this but would like to hear the original tuning sometimes. YAGI ?

John Connor no longer makes new instruments (retired in 2015) but still has his website since 2016. https://www.connorconcertinas.co.uk/ YAGI ?

I found this chart of Stagi 40 button assuming C/G tuning. http://www.accordionary.com/en/product/4954/stagi-anglo.html YAGI ?

I came across this youtube clip. Dipper with pierced metal sides. YAGI ?

They are preparing English ones. Online store will be updated in the next week or two. Unfortunately overseas shipping seems not yet available... YAGI ?

Just noticed this one from @gcoover on ebay (presumably Gremlin badged Norman). Accordion reeds are mounted on the individual reed pan like traditional instruments . Now many hybrid makers fit reeds behind the action board. When it has changed ? Photo is from ebay.

My miniature anglos. Jones 26+2 button (semi-miniature), Jones 10 button and Norman 13 button. YAGI ?

Thank you for the lever photo. Hooked action and numbered keys look like early Lachenal to me. If Lachenal, @Dowright would you please tell the approximate year of this serial number 11900 ? YAGI ?

Does it have hooked action or riveted action? Photo of the levers might help. YAGI ?

What a beauty! Is it English or Duet? YAGI ?

The bellows paper looks like Jones to me. YAGI ?

Just FYI, McNeela lists a Jeffries with pierced metal sides now. https://mcneelamusic.com/c-jeffries-38-key-concertina/

There is a Jones trademark on the hand rest...

Works OK for me here in Japan at 10:55 GMT. But when I do not log in that is not viewable.

Just noticed vegan concertinas who makes custom concertinas using vintage recycled reeds.

Just FYI, Barleycorn lists a Dipper with pierced metal sides now. http://www.concertina.co.uk/stock-selection/?concertina=3145

C and S issue 31 mentioned above thread had a photo of similar one (Crabb). Except for that I can only recall wooden ones.

I found a different version of J Wallis label without 'PATENT' (not mine).