American Airlines Captains Million Miler Award Bulova Watch.
Welcome and thanks for sharing. It is curious that the case back is dated L7 (1957) but the inscription states 1953. Is it possible the last number is an 8 and not a 3? In any event; by case date, your watch appears to be a
1957 Surfmaster "D"
Like THIS ONE
Thank You for the comment and info. It is odd about the dates. It sure looks like a 3 and not an eight but maybe AA was behind on awards?
In reply to Thank You for the comment… by pretzel
That would be the most logical explanation.
It would also explain why I could not find it under the 1953 Bulova models. Captain Etzel did a lot of flying for AA between 1944-1970. A bit of it was overseas.
For reference: 1957 Bulova Surfmaster "D".

Agree with Surfmaster "D"
1957 Bulova Surfmaster "D" is a good match. Odd about the dates.