Two Essex II tanks have appeared on eBay in the past few weeks. The Mark II has the knob to open Leica cassettes and is the equivalent of the Rondinax 35U. Neither was described or photographed very well. The first sold for £5.50 so somebody got a bargain. The second was broken and the starting price was £14.99. Needless to say it did not sell. Some people really do not have a clue how to sell things on eBay.
I have added information on the Mark II to the page devoted to these tanks (in the Menu bar above).
I do not have nor have ever seen an instruction manual for the Essex Mark II. I will try to get one in the coming months to include with the downloads.