Thanks for your comment @khanmu. I'm grateful for the help of a true Breitling expert (whom I have not yet seen on this forum) who confirmed that it was legit. He told me what it was, and that he was going to buy it if I didn't. 😀
New arrival Memovox joins the alarm gang. Thinner than the Bellmatics, but is much louder and looks pretty robust to boot! Will be off to get serviced soon, and in the meantime I need to find a nice strap for it. Loving the case and dial so far: