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sigleraddict said: I  think they both have their faults.   After reading all the posts a few concerns I have would be,  it needs to be simple to see which books are the main books in a series and which are the additional books  which the first system sort of does, but damn it could get confusing with more than 3 or 4 decimals.    The date system, does not clearly identify this either,  and you will have things in the dates (especially in the crypt character stories) that have flashbacks.  Also you will get a lot more confusion from new junkies with this system.  Definitely have both a complete list in order of your books in the front of each one, and an explanation page of your sigler verse number  or else you will get the same eternal questions from new readers    

I think you need to do a two tier system as you have made examples of but not use the initial decimal.   State the era,OLD,  MODERN, CRYPT, GFL,  and then the book #, and sub story #, etc   but keep it as short as you can.     This also allows for expansion into new story eras  (You can give me my own battalion in the army for that suggestion, I don't need my own tank).

let me re work your examples to show you:

( "THE ALL-PRO, Book 3 of the GFL Series (Siglerverse GFL 3) )