That is not a knee knocker cab my friend so it is definitely not a pre 1963. 1965 sounds about right. Is that cab and hood original? If so, they're both tell tale signs of being mid 60's. The 60-61 and some 62's had the "bug eye" hoods still. They were all gone by 1963. That cab is 64-66 for sure. The last year of the knee knocker trucks was 1963. Yours is not one. Hope this helps.
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