The seller stated that these gloves were brand new and originally retailed for $335, but that this style is no longer being produced.
Agent Provocateur is a British lingerie retailer which also sells some leather accessories, hence these gloves.
As a bonus for reading to the end of this post, this slightly shorter 20" pair sold for $94 back in 2013. http://ebayleather.blogspot.com/2013/04/unusual-long-black-leather-gloves.html