Originally, the Model 1911 pistols were fitted with walnut stocks checkered in the 'double diamond' pattern. Pistols produced by Colt used a specific checkering pattern (number of lines per inch, number of checkering lines between the diamonds), while pistols produced by Remington-UMC and by Springfield Armory used a slightly different checkering pattern. All of those early grips are eagerly sought by collectors and those attempting to restore early pistols to factory standard condition. A quick Google search will provide all the information you desire (and probably more than you really want to wade through).
About 15 years ago I came across an original set of Colt 1911 grips, still in the oiled paper wrapper, brand new and unused. Bidding went off the charts on eBay, and I ended up getting more for that set of grips than I have paid for quite a few of the 1911 pistols in my collection.