Just an observation... I have two George Jones concertinas and a couple of Lachenals and have just discovered, (from Andrew Norman) that George Jones "accidental/incidental" (outer) rows had/have a slightly different layout to the standard Lachenal or Jeffries layout ie: Left hand: Jones (and early Lachenals) used E push/G# pull on the lowest button, later everyone went to E/F as the lowest button
Right Hand: Jones used D#/C#push for 1A, G/G#push, Bb/c# push, the f/a (like the highest Lachenal button) then a high d#/and very high c on the push (Credit to Andrew Norman for this info as he is currently restoring my third George Jones (although keep an eye out as I will be selling at least one of them shortly to pay for the current restoration :) )
So a reflection on the button pattern might shed some light on whether it is a Jones?
Gerry S