One of the experts here can tell you if R54 has a plating guide or not.
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I've never ventured into the area of plating, how is it done?
To start with, hopefully, someone has put together multiples and identifiable positions (e.g., margin copies) to reconstruct a sheet. Multiple plates require that much more work. A record of that work may be a descriptive list of individual markings on each stamp or a good photo or photos.
Then you match up distinguishing characteristics (like those noted below) to determine the plate position.
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What is required (other than a lot of stamps)?
If you plan to do plate reconstruction yourself, it will, with multiples being very helpful. Otherwise you just need a magnifier and a reference, as noted above. You also need a critical attitude that will not make you imagine things that aren't there or ignore things that are there.
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I've noticed on all R54's, the bottom figure "5" on "50" always show marks, are these marks useful when plating or are they ignored?
They are likely part of the information needed. Note also on yours there are two guide dots in the upper left corner margin. Blurs, double transfers, weak transfers, re-entries, recuts, etc. are all what's used to describe and determine a plate position.