As Alistair's instrument has 56 keys, if I recall correctly, that would make it a model 24.... but that is just Anorak-ism after all.
I did get to try it on one occasion ,about 30 years ago a distance of time which puts any impressions I had then in the unreliable category. The type of reeds in these Vintage instruments ( Alistair's probably is at least 100 years old) would be Steel tongues in Brass frames, the frames fit into the Tapered Dovetail Slots of the Reedpan and thus are quite different to Accordion reeds.
There is a certain Harmonica like tone quality to some of the Model 22's and 24's....
Coming to your other point Oren: if the Equal Tempered Thirds on the Accordion reeded EC's appear to be harsh then I'd expect the Concertina reeded instruments, especially the metal ended variety will grate on your sensibilities even more.
I have chosen to tune my EC's to a Meantone Temperament which sweetens these thirds but still allows for playing in a good varierty of keys... I think Ab,Eb,Bb,F,C,G,D,A,E should all be possible on the EC tuned to a Meantone.... ( and their related Minor keys as well)...
There are quite a few varieties of these Meantone Tempéraments, Quarter Comma being the one with the Perfect major thirds and is the one I like the best but because the spread of the pitches deviate quite a lot from ET this can make playing with other fixed pitch instruments a little difficult. So I chose to opt for the next stage closer to ET ( but still a Meantone)... called One Fifth Comma. With the 1/5th Comma each of the notes is about half the distance away from ET that they would be in Quarter Comma. I have yet to have complaints from other musicians... which might suggest that they don't listen closely or that they assume I'm playing in ET like 99.9999% of the rest of the world.
You can hear how these different tempéraments sound ; see if you can find recordings of Danny Spooner (singer with concertina accomp.) if that is he still has his concertina tuned in 1/4 Comma (which I tuned during the '80's).... or Adrian Brown ( a member here) on the Dapper's delight album where he also plays concertinas in 1/4 comma. Also there are several tracks of my playing in 1/5 Comma on the first four months of "The tune of the month" forum here on C.net.
Edited by Geoff Wooff, 10 April 2014 - 06:23 AM.