Casio's Oceanus Retro Tone Collection is now buyable in Japan: 300 Manta OCW-S400RL-8AJR at ¥165,000 and 500 Classic Line OCW-T2600RL-3AJR at ¥115,500. 4 Reviews ← exclude selected types ← exclude selected tagsCasio's Oceanus Retro Tone Collection (check out our launch coverage here) amounts to 800 watches for the Japanese market and nothing beyond it. The Manta OCW-S400RL-8AJR is capped at 300 pieces at ¥165,000, roughly $1,040. The Classic Line OCW-T2600RL-3AJR runs to 500 at ¥115,500, about $730. The main constraint is that a solar watch needs light to reach the cell beneath, so transmittance had to be carefully tuned.