Thanks for your help. Both of you have offered some useful leads.
I'm trying to find a point of entry, as a beginning collector, that focuses at least initially on one or two (or three...) largely overlooked brands. I picked up a couple of Eagles, and while the celluloid bodies are pretty the nibs didn't exactly make me break into song. Gathered up a few hints here and there that some Wyvern pens were well made, and came with good nibs for writing.
I didn't take the lack of response personally. I don't always respond to e-mails that appear out of thin air either, especially if I'm in a busy period. And one of the people I wrote seems to have all but stopped their online activity. For all I know they're ill.