This is quite a fun, and mercifully clear-cut  section. All you need is a perforation gauge. I do not intend to even try and  detect one type of perforating machine from another and the imperforate sides that I have featured are those that were specifically produced to give booklets straight edges. (These are some of my favourite items and very worthwhile items to collect). If a machine went wrong and sliced across a sheet then that's an  error and, whilst possibly very attractive and eminently collectable as an extra, the results are not featured here.

If you are offered something of this ilk then do be  careful as we have all, in our youth, tried trimming off perforations and it isn't that difficult to produce some apparently spectacular items. Check the margins and overall dimensions very carefully and check with me first. Most instances of genuine imperforate varieties are well documented now.

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