Sir F. A. Rien wrote:
"Tony Clayton" found these unused words:

As we always look at watermarks from the back of the stamp I am
puzzled as to why some catalogues show watermarks as seen from the
front.

At least the Italian catalogues show what is seen from the back.

Relatively simple, watermarks are made to be 'read' from the -=face=-
of the working area. Look at any good bond watermarked paper. The
finely calendared surface is the one where you can hold the paper up
and rea the watermark as 'normal'.

I would observe that we are stamp collectors where looking at the back is
easier,
whereas collectors of bond watermarked paper (are there any? ;-) ) will look
at the front.

Therefore catalogue images as seen by stamp collectors makes more sense for
stamp catalogues!

Sheet markings, "POSTAGE" etc. are 'normal' when viewed from the side
meant for printing.
I have rarely seen catalogues detail sheet margin markings (Italian
catalogues excepted!)

--
Tony Clayton
http://www.coinsoftheuk.co.uk