Extremely Rare Superb 2 foot Rule.
Isaac Aston (1) 1814 – 1840 .
Isaac Aston (2) 1851 – 1870.
25 Compton Street, Soho, London.
Difficult to be definitive regarding the exact maker, however rule marked I. Aston.
Thickness can point to age, this rule ¼ inch, so this points towards 18th century.
Marked left to right.
Numbers appear to be around 1800, check the close up pics.
So my guess is the early Isaac.
This is a superb quality rule.