The circumstantial case for Royal Navy funding of the Vickers sight

What historical conclusion do you strongly believe despite lacking documentary proof?

The strong suspicion is that the Royal Navy enabled Vickers to develop the Skua's sight through hidden funding or a purchase assurance, though no confirming record has surfaced.

The case remains a strong suspicion: the Vickers sight fitted the Blackburn Skua too precisely to seem an entirely speculative product. Blackburn was a separate company, which strengthens the suspicion of a coordinated arrangement. Possible explanations include funding through other programmes, a promise to buy the finished sight in quantity, or a connection with Henderson's 14-inch-gun negotiations. No surviving document establishes which, if any, of these arrangements existed. Experience of missing Royal Navy paperwork explains the distrust of the archive, but supplies no proof of this particular case.