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Please note that I am not an expert on these military models, but some research that I have done indicates that the A17A models should have the outer seconds track with the 5 second indicators (like this one). This dial may be specific to the 3818A variant. I imagine these were quite interchangeable, for all parts of the watch. Most A17A models also show different hands. Anyway, just going on observations and information I've found. If you can access the movement, there should be a datestamp on it, which will help identify the year (assuming originality of all parts).

Military Issue