They would have had a parts code at the time, but I certainly can't find evidence there vas any V-code assignment (The V-Code being the designated parts code system Victa released in 1970 I beleive) at the release of the V-Code system, V-Codes were assigned to prior models right back to the Model 1, however the Model 4 is not mentioned at all in the V-Code release papers, assignemts going 2a (V3) Model 3 (V4) Model 5 (V5) as below.

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Also, in one of the parts guides (1955 - 1969, available on Victa's website from 2007 - 2009) there is also no model 4, again, 1, 2, 2a, 3, 5.

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Cheers
Ty

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