I posted a picture asking what this may be with some good guesses.

I always thought it may have been for writing. A few e bay searches turned up fountain pen nibs. Attached is an auction to nibs holders.

http://www.ebay.com/itm/Vintage-Dip-Pen-Nib-Holder-5-Tapered-Wood-5-3-4-Tan-Holders-Unused-/262005699138?hash=item3d00c1b242

Barry