I came across these examples of "small print" written by my father and his friend (Bernard Attenborough) in 1934, all done without the aid of a magnifying glass and using a single haired paint brush. Bernard was a graphic artist and had a small printing works and was 'au fait' with fine work.
Unfortunately I do not have a camera which will do macro photography, but the signatures are less than 5mm long and quite readable under a magnifying glass.
It just shows what detail can be achieved by both the human eye and hand.
Bob

