In front of me is a classic double pill-box patent single aplanatic Grubb landscape objective. Bought for experiments, as the achromat lens has gone. According to VM, the early series (A - E) are related to the objective type: A meaning Petzval, E meaning the single aplanat, that is, the one I have. But mine, apart from the serial no. 1686 has the clear engraving A6! There is no way this could have been a Petzval earlier in its life as the two part barrel, internal extension, are complete. Anyone have any ideas as to the significance of the letter/number code?
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