28.P.S.K in Lodz in 1934-36
Wow! A rather famous unit! 28 Pułk Strzelców Kaniowskich (28th Kaniowski Rifle Regiment).
They were formed in Volyn in 1919 and fought against Ukrainians, against Czechs in Cieszyn Silesia and then, of course, against Soviets in the Battle of Warsaw. In the interwar period it was stationed in Łódź as a part of 10th Infantry Division.
There is even a historical reconstruction group for the unit. Here's their Facebook page...
... there's a lot of photos, maps and other information. Try to contact them for further details of anything related to 28. PSK.