Sketch help attributing

[luka77]

Dear friends , was asked to help sort out which are opinions?

Work with a hammer . Sketch of the stencil 20- 30- ies

 An unknown author . Gray paper glued to canvas , watercolor , 33.5 x 26.5 . Left on the edge - water stains. While creating the work of specialists does not call doubts , because Watercolor is so hardened that blurs together with paper ...

It seems to me that this could be a sketch stencil logo of a plant or a poster , which subsequently could be used .

Maybe someone came across anything like the original ? So it would be easier to identify the author .

Thanks for any suggestions on this work