Sentinel Station is a Watchtower-class design that has been employed on the periphery of the United Federation of Planets since Starbase 47, known as Vanguard, was built in 2263.
The feature film Axanar will include a Watchtower-class station. It is an independant film project featuring several well-known actors and it's trailer, viewable at https://www.youtube.com/user/startrekaxanar received 1.6 million views within it's first year. The film revolves around the Federation-Klingon war.
The Watchtower-class design was featured in the novel series Star Trek: Vanguard. It appears on six covers of the eight-book series. The novel series has been described as the HBO version of the original television series with darker characters and a much deeper understanding of the events around the episode The Tholian Web and the films Star Trek II: The Wrath of Khan and Star Trek V: The Final Frontier.