Help identify the author
 

oil on canvas

It is very unfortunate photo and wait for an answer until the sharp and clear photos not only a signature, but the picture <!--~ 10 "->

four left-fifth remained

A fairly well-known German artist Fritz Wagner (Fritz Wagner, 1896 - 1939), one can say who specialized in images of lovers of good wine (most often - for some reason the monks), who introduced them into fashion and who had a lot of imitators. Unfortunately, the signature on your picture - not his. Do you - or a copy, or "work reasons".

There are hundreds and hundreds of monks in the western auctions middling.

those 4 have sold a lot of money but this left but now given a lot of money like to ask the author do not speak

According to a bad photo that you gave, you can read the signature as "B. Treter". There was a Treter Bogdan (Bogdan Treter, 1886 - 1945) - famous Polish architect, artist and restorer. Best known as an architect. His work with oil in the network no, there is a pattern with a signature similar to the one in your picture (see attachment). Still, I do not really believe that the famous architect would create work for reasons other artist, besides his contemporaries.