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How to correctly pronounce "złoty" in Polish? "ł" letter [17]
Nowadays it's as close to the BrEng "W" as to be virtually indistinguishable from it.
I differ from your interpretation and agree with your portrayal of the cultured person from pre-war Wilno . There is more to replacing the 'ł sound with the W
even today, saying mały as mawy would sound weird, something with ca'ły and cawy or, in the case of Pawian 'łysy and wysy, so there is a slight difference, might be impossible for you to detect, which is understandable, but for Pawian, Polish borne all I can say using the words Pan Zagłoba ( not Zagwowa)
Jakas gwowa (głowa) kiepska, zapewne z Kielecka. So Jon, traditional 'ł, to a great extent, is being replaced by the W but not wholly; there is a lot of 'ł
remaining, especially in some selected words. When visiting Poland last time, my wife and I were constantly complimented on the beauty of our Polish.