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40 KEY C/G ANGLO CONCERTINA by CRABB. 1972.

Concert pitch A=440. Serial # 18374. Made probably early 70’s. TEN fold bellows. Comes with its original case, with the label “Crabb concertinas, famous for over a century”.
Key layout as follows.
PUSH/PULL:
Right Hand Side:

(F#’/C#’) C#/Eb A/G Ab/Bb C#/Eb A/F    (C”/D’)
      (F/G’)     C/B      E/D          G/F         C/A       E/B
          (Bb’/Ab’)    G/F#   B/A      D/C        G/E       B/F#
                               (Eb’/A)             (D’/E’)
Left Hand Side:

E/F A/Bb C#/Eb A/G Ab/Bb   (F#/C#)
     C/G      G/B        C/D        E/F        G/A         (Bb/C#’)
    B/A      D/F#       G/A       B/C        D/E         (F/Ab)

  (C/C)   same note – middle C

The keys in brackets are the extra keys (ie in addition to a 30 key instrument layout)
The ’ apostrophe indicates higher octave and ” the next octave.
I believe this is standard Wheatstone 40 key layout.