Sorry for the late replies. For some reason, I don't get email notifications of the comments made, which I have in the past. Yes, the concertina is still for sale. I haven't weighed the thing, but it's not the heaviest thing, like a little more than half the weight of a Hohner Pokerwork melodeon. I thought Alexander Prince and Perci Honri played standing up. I can get you a weight later though.
I have a 51 key Maccann that's occupying my time and I wanted to sell this to invest in my steampunk hat making business, which has since failed. Ha! Oh well. The location of said concertina will change to Texas in November when I move back to resume my old job and I may just keep it because it's cool.