I bought this described as an A-11, but learned that the caseback appears to be from an ORD watch. I believe the date code is a circle, so I've taken the date to be 1944. The movement model is hard to read as it's obscured by the wheel driving the centre second pinion, but it looks like it may be 10AK.
Thanks for the comments.
I had thought it most likely that the caseback had been swapped with one from an ORD watch, but perhaps someone here knows different.
I posted the watch on WUS asking for info and someone replied 'There is an A-11 type watch that comes in the ORD marked watch cases. These are stamped "OFA". These are not common.'
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