![]() The AN5740 variant utilized a slightly larger case with knurling on the outside edge of the case. A question to the members of this forum: Is anyone aware of any other manufacturer of the A-13 other than Elgin? ![]() To the best of my limited knowledge, this watch was only manufactured by Elgin. The case is smooth and slightly smaller than the cases used on the later variants. "GCT" is marked below the center of the dial. The A-13 has a white dial, with the minutes marked from 0-55 and the hours marked from 0-23. Pulling out on the stem stopped the movement. The A-13 was the first variant to include the "hack" feature into the stem. A question to the members of this forum: Is anyone aware of any other manufacturer of the A-9 other than Longines? To the best of my limited knowledge, this watch was only manufactured by Longines. The hack feature was a slide bar at approximately the 2 o'clock position on the case. ![]() The A-9 was the first variant that had a "hack" feature and was manufactured for the U.S. Summarizing the latter/post Weems development of the Master Navigation Watch which eventually evolved into the AN5740-1 variant: The following three threads provide useful background.
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