Łódź is the third largest city in Poland with the population of about 750,000. It is located in the central part of the country. On the postcard you can see Ludwik Geyer's White Factory where the Central Museum of Textile Industry is now placed. It hosts exhibition of tools, textile machinery, clothes etc. The factory was built between 1835 and 1839.
The stamps are so nice + the special cancellation... What can I say? :D Thanks a lot, Krzysiek :)