Hi, everyone: I'm a new member of the forum, and relatively new to collecting Omega wristwatches. Recently, I picked up a stainess steel case with British Air Ministry issue markings dating to 1940. Can anyone tell me what it might be? It's quite small, with a case diameter of only 28.4mm, and looks like it would take a cal. 23.4 movement. Could it be a military version of an Omega Chantilly? I'd be grateful for any thought or additional information. Here are a few photos: Thanks!