The OM ("Orchestra Model") is a smaller bodied instrument originally developed by C.F. Martin and Co., using the 000-body size but with scalloped bracing and the 1/2 inch longer scale of a dreadnought.
This particular guitar is nearly like new, having only a few slight marks to indicate that it is a "used" instrument.
With its hardshell case, it's here for $2150.
I have always been partial to Larrivée guitars. Their craftsmanship is second to none, and they invariably have a remarkable sound.