Captain Thunderbolt was released in 1953, directed by Cecil Holmes and starring Grant Taylor, Charles 'Bud' Tingwell, Rosemary Miller, Harp McGuire.
Posters and advertising material for Captain Thunderbolt are exceptionally rare. The Australian daybill pictured below has the "Ray Films" logo as part of the printing and seems to be the only Australian poster that has surfaced. I believe that the "Ray Films" reference indicates that the poster is an early reissue / re release.
A full colour daybill may have been printed for the original release and most likely printed by W.E Smith.
Original stills have been found and I have two listed here …
Captain Thunderbolt Movie Stills