Columbian Commemorative

1892 columbian expo. half?
I purchased this commemorative coin on yesterday and would like to know what it would be graded. It has about 75 % of its mint luster present and looks in my opinion proof-like. All of the lines on the sails are present, also the hair has much more detail than the scan shows.
http://www.flickr.com/photo_zoom.gne?id=2221138409&size=m&context=photostream
http://www.flickr.com/photo_zoom.gne?id=2221930136&size=m&context=photostream
The typical Colombian has a frosty luster, though all luster combinations can be found, including some proof like coins that are so sharp that they have been sold as Proofs.
It’s is too hard to place a grading on a coin without actually seeing it. From what I can see in the photos, the design shows full detail with friction over most of the surface and flatness on high points. This looks like it would grade somewhere between EF-40 to EF-45. One cannot see the luster of a coin in a photo, and this is important as well and the strike of the coin.
I would highly recommend that you remove it from that cardboard holder and put it in a Mylar flip. Those cheap cardboard holders will cause chemical reactions and dull the coin as well as cause discoloration.
Hope this helps.
Columbian Exposition Issues 1893, us stamps