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Same applies. Still a recent phenomenon. A fraction of a mm difference in character size or spacing isn't an in your face thing that people who only want an example or two of a type are likely to notice. Variety collection is almost exclusively driven by literature, not from a desire to do the basic research. Nerds in every field have always been the exception to the masses, but until pen is put to paper, their research is shared only by a few interested people that bounce ideas off each other. They are the only people likely to have a big enough database of examples.

Wide and narrow dates, Rob ? Tut tut - it's large and small dates we geeks are talking here.

Supply and demand. He has one available and none of you need one. It's a niche product. 10 years ago there was virtually no mention or discussion of wide and narrow dates, and I would suggest that demand is determined by the number of specialists rather than the average collector. If the general references used by the masses don't include these as varieties, then people are not aware.

Collectability is in the eye of the beholder 😉

Cartoon strip from the Daily Mirror, 1919:-