Holy smoke, Roger... here I thought you were "just" the desk pen guy! (Those are totally benign quotes, by the way.) That one shot of just shy of five dozen pens is more than my entire collection (including parts pens).
I am primarily flattop Sheaffers 1912-1941. I do a lot with deskbases 1925-1942 and the lamps. I really haven't focused on the metal flattops but, I need to study those like I recently did on the HR flattops - I learned a lot through that process. I have a few pens - more than what makes my wife happy.
I hadn't counted them but no doubt you are correct. When I did my review of HR Sheaffer's I was looking at 109 of them and I still don't have representative samples of every model produced. I do have several duplicates. The 34 must have been a popular model as I have several of those. Hopefully I can get an article written up on the HR stuff.