perforation began as line and ended comb type, with many irregularities. 2 machines were applied sometimes simultaneously. the first line machine was rebuilt with new pins. centred copies are almost unknown. missing pins, blunt or sharp perfs, skewed lines and varied proportions are all known.
perforation is one of the keys to plating. locating the columns on sheets of 100.
slideshow here
Sunday 10 December 2017
Sunday 22 October 2017
Wednesday 11 October 2017
Monday 25 September 2017
Friday 22 September 2017
ovals weak, thin frame
4372
4435
4437
4469
4470
shades vary, but thin frame and fine details are common. last 2 are dry prints ( see oval). ovals missing frame lines in many cases
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