Roger64,
Be sure and check out anything that doesn't display on the Reader Library or your 505 not just in Sigil or Calibre. As was pointed out, it doesn't display, but it can leave a hole where it would be. On your title page, it might not matter at all, but in text I have found it very annoying, where pages numbers are invisible, but the space where they would have been is not, with a gap like this in the middle of a line.
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