An Old Small Lufkin Steel Rule No. 2707 - 4" (USA)
Marked 'No 2707, The Lufkin Rule Co, Saginaw, USA'.
The rule is marked with a multitude of measurement markings with many different increments including some ultra fine increments.
These tools came from an old engineer and his father before him, nearly all his tools have dated to 1910's - 1930's
(not 100% on date - in super condition)
You will struggle to find a better example.
Condition: please see photos for condition.