I was amazed by the chemically etched/raised pattern, not fully polished smooth, tubes of the E. Blancke of Naumburg at the Charlton Hall Auction( http://www.charltonhallauctions.com) lot 2018 of the December 2008 sale. I would have bet it was mechanically etched but Dig, Drew & PeteM convinced me otherwise. True the Irish/Dublin, of which W. & J. Rigby is included, began the process in 1818. Too hold and feel the pattern is simply amazing.

Kind Regards,

Raimey
rse