This carpet is a classic example of mythological/pictorial rugs which came from Kerman around the turn of the century. Although not at all pictorial rugs are isolated to this specific time period, much of the production span in Persia of this type of rug (with Shahs'/kings integrated into weavings) took place between 1890's to 1910. Although it could be from the 1870's as the seller says, I doubt this to be the case. It is probably more accurate to say maybe 1900 or so but no newer than 1915. It certainly is a Kerman in all respects, although probably inspired by a rug made several years prior which is sited at the bottom of this post.
Although within the Western markets here in the States, these particular carpets never fetched a high premium. The exception to this would be the late 70's and early 80's where the Iranian government was purchasing these rugs at prominent auction houses in London and New York for big bucks. Pictorial rug popularity has somewhat dwindled in this part of the world as the historic importance of such rugs pertains to the areas in which the rugs were created, namely Iran.
There is a very similar carpet (an inverse/mirror image to this one) which is in the Carpet Museum of Iran. I believe that particular carpet can be traced back to a early 1980's Sotheby's auction where with the buyers premium and final hammer price brought in somewhere around $25,000. Although, the rug on eBay and the one in the museum appear to be of different vintage and quality. This carpet is known as a "nymph" design, and there are probably more than several in existence. We know of at least one rug very similar to this rug which surfaced sometime early 2007 in an eBay live auction. Take note, that although there may have been a similar rug which sold at auction for high prices, this is completely dependent on actual quality, condition, design execution, and current market price. I believe the rug in the Carpet Museum is probably of the extra fine kerman quality of 550 KPSI or so. In general, the current market for these Persian pictorial rugs is not quite what it used to be, although one never can tell unless the same rug is sent back to auction at a later date.
Surprisingly, although many of these rugs were hung on walls for decorative purposes, this particular carpet does show some areas of wear and classic "corduroy" effect from use. The rug photographs very well, however take a very careful look at all photographs, maybe 3 or 4 minutes scanning all photographs for areas that look as though knot heads are showing:
This does affect value.
In the meantime, take a look at this rug which is in the Carpet Museum of Iran, I believe the rug in the carpet museum predates the one on eBay. I say this because the one on ebay is less ornate, and almost is a "zoom-in" of the one in the Museum.
http://www.carpetmuseum....ollections/htmls/111.htm