I think you are probably underestimating the age of this “Slater” lens by a decade - or more!
The lens looks more French than English - especially the double edged focusing wheel and the unique pinion cover.
The engraving “ R. Beard patentee” is reference to the very first active UK Daguerreotypist, Richard Beard, who obtained a license from Daguerre in 1840/1. Slater probably just bought in a lens from Paris and then supplied it to Beard. Slater was basically a telescope maker.
As Beard was out of the photographic business by 1849 (bankruptcy) a 1840’s date is more likely.
Richard Beard’s life is here.
https://en.wikipedia.org/wiki/Richar...(photographer).
He is best known for daguerreotypes of the members of the Disastrous Franklin expedition.
Your focusing problems could be due to this being a very early Petzval - where there is quite an adjustment needed to the visual focus length to come to the chemical focus length
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