Hi Emanuel,
Thanks for the note on LaCoste, and I do recall you telling me that some years ago on the deterioration on flyssa production after 1850. The continuation of other producers with the understandable variations outside the Iflissa perview makes good sense, and explains many variations as you note.
Thank you for noting that reference on the acquisition of 'first yataghan' etc. My note was from a conversation many years ago rather than hard reference so I would be grateful to update my notes
All the best,
Jim