Well, I'm really stumped on this one. First off, Cockers have never had an authenticity tag with the two lines of numbers - only one - regardless of year of manufacture. So this always makes it difficult to pinpoint a year or season.
Because of the "substyle" of this Cocker (as in being full intrecciato, instead of on the pockets only), I was going to guess it as Spring/Summer 2006. There were some exotic Cockers done that season in the same style as the one you posted.
I don't know what colours were done in 2006, sorry. It is possible it could be a 2007 bag, but the only Blues I can think of that year might be a bit too light compared to the bag in your link. Maybe Cobalt? But that would put it a bit later and I don't think it was?
I have seen this style bag in both Ebano and a Red colour. I see the one in the eBay listing has a light blue lining? The Red Cocker also had a light blue lining. Again, making me think perhaps 2007, as BV did a light blue lining that year in a couple of different colours.
Regardless, it has to be before the end of 2008 because the Cocker was discontinued at that time. I don't even know if they manufactured them for Fall/Winter 2008/2009. I'm sorry, I'm just thinking out loud.
You could ask the seller when she purchased the bag maybe?
It is a nice bag, and not one you see everyday.