Sunday 10 December 2017

perforation ...

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

Friday 22 September 2017

ovals weak, thin frame

4372


4435

4437


4469


4470


4480 OF


4399 OF

shades vary, but thin frame and fine details are common.  last 2 are dry prints ( see oval).  ovals missing frame lines in many cases


the above are possibly 1890 plate 52 ... or 1886 plates 39 40  1878 plate 11a

inverted watermark ...


most plates in lapidar group show inverted watermarks.  this is my first find