Interesting, Rool&Go-C, I was under the impression that the plectrum banjo came into being somewhere around 1900 but I could be miles out.I think 1920's is a little bit late for the tenor banjo. The dates I have seen vary a bit but I think we are looking more at 1910-1915.
Whatever, while I am here, I will add my vote to fitting tasteful geared pegs.
Jon