Here in all it's glory is a full page board of 'Black Beauty' from 1974, here you can see clearly the registration mark (top middle), width and height lines at the side and bottom, along with the issue and page number.  Note that the strip title is not in place this would be fitted later.  No sign either of the top page lettering, which would have been inserted later too.

Picture courtesy of Shaqui Le Vesconte.

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