"Well, yes - but I have my point was that I can think of no other example of a 'Harmonics' stop (with a composition of 17-19-flat 21-22) by HWIII. Whilst, on paper, one or two of the mixtures at Liverpool Cathedral appear to come close. the composition of many of them was altered, either during the building of the instrument, or shortly afterwards. Goss-Custard hated tierce mixtures, apparentl"
In its original incarnation, as built by HW III in 1928, the University Chapel organ in Glasgow had a four rank Mixture stop on the Great of 17 19 b21 and 22nd. It was an entirely new build by HW III. Although it's shown as a Mixture in NPOR, it does run in my head that it was actually labelled Harmonics.
http://npor.rcm.ac.uk/cgi-bin/Rsearch.cgi?Fn=Rsearch&rec_index=N11996