In the heyday of the fountain pen, the top end pieces were likely intended to be given as gifts, same as today. The only possible difference I might see are the number of speculators who buy from intentionally limited runs. The speculation seldom pans out, from what I can tell.
My own considerably more down-market 1936 Sheaffer is a pen that saw daily use. A good guess, based on what is in front of me, is it could have been the property of a bank employee.
It was manufactured at the height of the depression (or at least close enough to see it from there). Steel nib, nickel plating. Formal but not too formal appearance. Sober appearance. Nothing like the huge red and yellow Parker flat tops of the 20s, this Sheaffer is a
steamline. The implication being it's a smart, modern pen! Also undersize, so perhaps the property of a lady.
It's too nice for a teller and not nice enough for an officer. Would have been someone who signed a lot of papers.
That's my reasoning.
And a photo of the 36 isn't readily available, which brings me to these two, a 49(?) Sheaffer Tuckaway in green, and the sterling 70-72 Sheaffer Imperial. The Tucky was definitely marketed as a ladies' pen through to the introduction of a new ladies' line in the 50s. The Imperial is pretty awesome, and might do me well to switch out my pink Lamy Safari for the Imperial in these winter months.