OO6044M-01 is the Japanese release limited to 5 "prototypes" for sale in Japan during the Olymmpics. Darker shade of frame coating with Prizm Black lens. ¥242000 sale price.
OO6044-01 is the regular, limited release that was recently available. Lighter frame colour with Prizm Black Polarized. $410 sale price.
Wanted to note this because the entry in the database has a mix/match of both of these colourways, and I didn't want to add a new entry or modify the current entry to untangle it in the event I do something wrong.