Yesterday a member sold one, he said he received 44 while thinking he'd receive a smaller one.
There are chances the 42mm is a mistake. I asked the dealer (finally a TD, sorry for my above mistake), let's see.
Edit (link to the sale)
New Breitling Superocean chronometer A17376
For sale is a 44mm Breiling Superocean chronomter in new, unused condition. It build with swiss Sellita sw-200 movement with engraved serial of the watch, and the new style dial, ceramic bezel and rachet deployant clasp.I ordered a smaller size, but unfortunately the bigger came. Checked and...forum.replica-watch.info
It's confirmed to be 44mm