PRWeek reported that Casio had put the accounts out to pitch in May.
The company has hired Mission for its G-Shock range and John Doe for Baby-G.
Tim Gould, head of marketing at Casio UK, said: "The decision to work with separate partners for each brand enables the agencies to really focus their expertise. We were really impressed with the creativity of the ideas presented and together are confident we can continue to drive our brands forward."
Last year Casio invested £500,000 in an integrated PR campaign for its G-Shock brand. The campaign was handled internally with support from consumer PR agency Village and b2b PR specialist CMJ Media, which has had a retainer with Casio since 2010.
In 2012 Casio appointed Exposure on a project basis to work on its motorsport-inspired range of watches.