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| Cast |
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| Tim | SCULLY, Sean |
| the guide | RANDALL, Walter |
| Van Helder | KELLING, Thom |
| Piet van Helder | VERBRUGGE, Jacques |
| Aanike van Helder | SPURR, Sandra |
| Mrs van Helder | SCHAGEN, Riek |
| Grandpa | LEMAIRE, Jean |
| man in blue | SOER, John |
| diamond cutter | OSTRA, Paul |
| police superintendent | MADE, Sacco van der |
| Dutch thugs | DOTING, Gerard |
| | KOKSHOORN, Frans |
| | BROUWER, K. |
| London crook | RODEN, John |
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| Credits |
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| Director | WILLIAMS, Derek |
| © | Children's Film Foundation |
| Production Company | Wessex Film Productions |
| Producer | DALRYMPLE, Ian |
| Production Assistant | ROBSON, Joan |
| Assistant Director | BRACKNELL, David |
| Continuity | MATHIESON, Muirne |
| Screenplay (uncredited) | DALRYMPLE, Ian |
| | WILLIAMS, Derek |
| Cameraman | GURRIN, Geoffrey |
| Camera Operator | OSBORNE, David |
| Editor | HOSLER, Ernest |
| Music | MATHIESON, Muir |
| Music (uncredited) Conducted by | MATHIESON, Dock |
| Sound Recording | Anvil Films |
| Sound Recording (uncredited) | CAMERON, Ken |
| | SCRIVENER, Ken |
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