Takayuki YAGI

Or you can use this contact form to John Dipper. As mathhag said, with the serial number I think they can provide details. http://www.johndipper.co.uk/concertinas/contact.htm 🐐

Does it have "Louis Lachenal" label or "Lachenal & Co" label ? If the latter, it might be 114949 (leading 1 missing) or 14949X. I once saw the photo of 15130 (slightly later than yours) which had "Louis Lachenal" label and numbered keys. That was with 20 buttons though. 🐐

Just FYI, about Mrs. O'Dwyer (The Irish German concertina project by Dan Worrall (archive.org)) and review of the resulting project CD ("Tripping to the Well" (mustrad.org.uk)) 🐐

MP4 and PDF work fine here. Thank you. 🐐

Same here. Returns Error code: 2S328/1.

End grill is not an Edgley because Edgley instruments have end bolts on the corner. The instrument in the clip looks like Jeffries anglo to me but I may be wrong.

I think some model of Lachenal and Wheatstone have such slots for air levers (bowing valve?). But I am not sure they only have slots or they have actual levers. For example (from buttonbox.com), Lachenal: https://www.buttonbox.com/images/ceu0558-02b.jpg Wheatstone: https://www.buttonbox.com/images/ceu0557-02b.jpg

Number stamps reminds me of these pictures. So could it be a Tidder ?

This reminds me of Wakker midi (archive.org), but it seems to be discontinued. 🐐

I am curious about action improvement. The Button Box of Massachusetts also says (from some months ago) about Stagi W15-LN as "30-button model with new improved action." I am not sure the improvement is the same but would like to see the improved action photos. 🐐

One example ...... https://www.instagram.com/p/BsCRTPtneL9/

If I understand correctly, ESB is a baritone(1 octave below) and Cormac plays both baritone and bass(2 octaves below). I am not sure the one in the clip is a baritone or a bass. As far as I know, Dipper makes bass anglo. 🐐

In my case, it was a C row with C# and F# accidental. But if it was in G and 3 buttons top and 2 or 3 buttons below, I think Dipper layout in fig.9 (of PICA vol.9) makes sense.

I do not have an action photo, but here is a reedpan photo of Norman 13 button miniature (accordion reeded, treble side).

In the PICA vol.9 http://www.concertina.org/wordpress/wp-content/uploads/2014/10/PICA09-2012.pdf , fig A1.3 shows reedpans and an action board of a Jones miniature.