There is a clear progression emerging with wide disparity at either end of the decade. The quoted 1971 price of £18.00 for an HA114 is in stark contrast to the £78.00 which I paid for the same model in 1978.
In fact there was already a Hohner price rise 3 months after that January 1971 catalogue, and there's an "April 1971 - Revised Prices of Hohner Accordions" list stapled into the back of it:
January AprilHohner Shand Morino ............................. £345.00 ............... £375.00
Hohner Gaelic IVS ................................. £123.00 ............... £140.00
Hohner Club III M .................................... £91.73 ............... £106.00
Hohner Amatona ..................................... £68.00 ............... £80.00
Hohner Trichord (3-voice) ........................ £66.00 ............... £75.00
Hohner Primatona .................................... £57.50 ............... ££70.00
Hohner Club II B ...................................... £54.75 ............... £65.00
Hohner Trichord (2-voice) ......................... £50.00 ............... £60.00
Hohner "DoubleRay Black Dot" De Luxe ......... £47.75 ............... £51.40
Hohner Corso ......................................... .£47.75 ............... £51.40
Hohner "DoubleRay Black Dot"..................... £28.00 ............... £29.50
Hohner Erica ........................................... £28.00 ............... £29.50
Hohner 114 Melodeon ............................... £18.00 ............... £22.00
Hohner 1140 "Vienna Style" Melodeon .......... £16.75 ............... £20.50