1948 SIKORSKY S-51 HELICOPTER "CHARTER SERVICE"..1-PAGE COLOR SALES AD (280SS)

1948 SIKORSKY S-51 HELICOPTER "FIRTH BROWN"..1-PAGE COLOR SALES AD..(257SS)

VINTAGE..1948 LURIA STANDARD HANGARS ..ORIGINAL SALES AD...RARE! (858N)

1948 WESTLAND S.51 HELICOPTER "SIKORSKY HELICOPTERS"..2-PAGE SALES AD (239KK)

1948 SIKORSKY S-51 HELICOPTER "BRITISH BUILT"..1-PAGE COLOR SALES AD..(793X)

1950 SIKORSKY S-51 HELICOPTER "RUNWAYS UNNECESSARY"..1-PAGE SALES AD..(860X)

1948 WESTLAND S.51 HELICOPTER "SIKORSKY HELICOPTERS"..1-PAGE SALES AD (226KK)

1949: SIKORSKY S-51 HELICOPTER "WESTLAND-SIKORSKI" 1-PAGE COLOR SALES AD (288SS)