I forgot to mention in my last posting to you that CVs are usually for MNH or at least mint, but for used I was once told they can be calculated at 6 times the CV of one single stamp used but this is NOT an accurate way.
I am not aware of any special listings where they are catalogued as used.
In fact, I have a small collection of used plate blocks myself and would like to know.
I think used blocks and especially used plate blocks in fine to very fine condition add variety to a collection and I usually always put them in my albums when I manage to acquire them. I imagine truly commercially used plate blocks would be very scarce as I expect most would have been used by collectors and are therefore "philatelic", although once off the paper, who would know.
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