We saw this SBLim2 304 in the Polish Aviation Museum at the start of a trip to several Polish Air Force bases in 1991. Much our surprise, we saw a flying 304 a few days later at Babimost. Very confusing! The flying one was c/n 1A-03504 (which still flies today as N304SB). The one in the museum is c/n 3404 and still is in that museum more than 30 years later.