Well, the movememt looks off. The rotor is is dead giveaway. The ROO is powered by calibre 3126/3840, see here:
https://www.watchcollectinglifestyle...-oak-offshores
There are a couple of variations on AP's website for the rotor which I've uploaded, I think which version is used is linked to specific editions, however the base calibre is the one with the gold weight.