Only first pattern clasp knives have been identified as having been made by Tatham. Not all of the Tatham knives are marked with a makers mark. Examples exist that carry only the Inspectors mark. However these knives are readily identified not only by the Inspectors mark but also by similar characteristcs which are common to Tatham clasp knives.
This knife is slightly heavier than the other first pattern clasp knives. The most significant difference with this knife is that it usually has a steel shackle, however one with a brass shackle is known.