Wow, first of all this is an amazing find. So "foxrun" was a brand that has been around since the early 1900s (they originally made classic sportswear and fox hunting gear) and later expended into fashion pieces. They became a niche fashion brand toward the 90s, ironically when hunting fell out of fashion. The "rainbow" tag (as foxrun collectors call it) is hard to date because it was used in the 1970s and then again during the y2k era (as a throwback). The surprising thing about this brand is that the acrylic and genuine (bonded) leather pieces are more valuable than those made from split hide leather or natural furs. In addition, this brand would concentrate on certain colors each season: orange is the most common, purple is slightly more rare, lime green is pretty rare, but forest green is the rarest. What you have here is an extremely rare piece that you shouldn't have a problem fetching $750 on ebay.