A new online resource reproduces the surviving record books in the Dallmeyer archive held at Brent Archives, covering the period 1863-1902. Although the pages are not searchable the photographs of the pages are relatively simple to search. If you are fortunate you will be able to locate a lens serial number, identify what it was made as, who made it, when it was sold and who bought it.
See: http://www.thedallmeyerarchive.com/Records/Identification.html
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