Hi Tom,
The rule of thumb for dating navajas, assuming that they are fitted with a spine spring, is by the locking mechanism.
Post 1900: External sheet metal spine spring, fitted with a release lever as per my earlier post.
Circa 1865-1900: Ring release and spring housed within the handle as per my earlier post.
Circa 1815-1865 Spring housed within the handle and no release mechanism (pick-lock)
Pre 1815: The spine spring is screwed to the back of the handle and no release mechanism (pick-lock) as in this picture.
The importation of French navajas into Spain commenced in earnest around 1850 and fell away after 1870. Given that that navaja has a ring release and a modified lock for the Spanish market, its date of manufacture was probably around 1865-70, maybe even a little later.
I do not know if these Spanish style navajas were sold in countries other than Spain. If they were, then it could have been made as late as 1890 or thereabouts. The Spanish authority Forton, simply dates similar ones as from the "late 19th century".
Cheers
Chris
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