www.indiancentvarieties.com there are over 24 known RPD for the 1907 IHC if you take your time you can match this one up at the link provided. Nice catch !
Longacre doubling doesn't occur on dates. It is part of the die creation process. The dates were punched into the dies later.
Thanks for the input and links. I will check out the link, CherryPickers' calls one, close in appearance, an RPD-001.
Thanks for the CAD mapping, I looked at the Indianheadcentvarieties and the closest I could find was the Variety 28, but I think the 9 on this coin has more detail. Thanks for all the help and interest.