I have a number of Jamin and Jamin/Darlot small size CdeV petzval lenses. The earliest of these is from around 1857 - with the very simple block letters JAMIN PARIS engraving and with no mention of the address or patents etc.
Underneath was a very neat copperplate signature “J.A.L.Pool”. An uncommon UK name, so perhaps traceable? Dealer, Chemist, Photographer or Instrument maker? No candidates found although there were a lot of “Pools” in New England. Perhaps someone has some better ideas?
There was a third line with a light scratching rather than engraving. This was “Jackson Bros Jumbo”. Jumbo sounded neither 19th century or English. But google provided lots of hits. Jackson Brothers were a very large photography business who had expanded from their original location known as Jumbo near a Railway Station close to Manchester (UK). They left Jumbo in the 1860’s so this Jamin had come to them quite early.
This area of the UK was in fantastic growth from the middle of the 18th century with great demands for the new captains of industry, civic leaders etc. The best known photo made by the Jackson bros. is the group portrait of the very first founders of the Cooperative movement in nearby Rochdale (at least in countries with a Social Democrat party!).
Who else has fun engravings?
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