I believe this to be an A11, the case looks like it could have survived a war. I am not accurate on the model or any other info. The crystal, back and strap are in great shape which leads me to believe they have all been replaced. Also it is not stamped like many others I have seen. Needs to be serviced because it is off by about 3 minutes per day but works.
Any corrected or additional info would greatly be appreciated. Thanks.