V. Kohlert and Sons clarinet age estimate ?

[OldInstrumentsAreCool]

I have a V.Kohlert and Sons clarinet that was my deceased father's.   I've tried to find the year of manufacture of this instrument (see pictures in link below), but it has proved difficult for me to readily find an authoritative answer via some basic internet searches.   The Maker's mark says it was manufactured in Graslitz Bohemia.  Can anyone provide guidance to me on this?   
Many thanks!

Here is the link:
Folder with Clarinet images

[350 Rocket]

My rough estimate is that it's from 1932. There isn't much information on Kohlert, but with the handful of data points I have, that's what I can extrapolate yours to.

There is or was a serial number chart for these compiled many years ago, but it's highly erroneous.

[OldInstrumentsAreCool]

Thank you very much for this information.