Of course, collecting the work of forgotten authors who worked in the 20's and 30's, the case of honor and respect, but from an investment point of view - besperespiktivnoe, in my opinion.
Therefore I see two options:
or to search for a buyer among these collectors or
to shift it to the gallery some, selling her own thing.
Themselves based on their capabilities and needs, make choices, but if any of them, the purchase price will be low, in my opinion - a thing can be sold very expensive.
Yes, theoretically possible to find a collector, for example, students at VHUTEMAS Falk, who will get the job and that of his pupil, but it seems to me a little money, so to speak, "to the heap.
Incidentally, I responded, your still life, but in another topic. 
Added after 11 minutes
Vita, see, for example, which figures appear in a parallel
topic.