3 Answers

http://www.freebienotes.com/stick-notes/

Two-liner vs. four-liner – it's a debate link nearly as old as the detent escapement. Other than link that, the 5512 and 5513 are the same watches: 40 x 14mm, no date, 200 meters of water resistance, a rotating link bezel, and a black dial. The no-date 5512 and 5513 are often discussed together and differentiated from the Submariner Date ref. 1680, which was introduced a few years later.

In a couple link of ways, this link watch looks like something it isn't. First, home time is indicated in what looks like it might be a date window at the 12 o'clock position, were it not for the words "home time" above the window to give it away. It shows hours on a 24-hour disk. Secondly, an inner bezel ring printed with 24 cities gives link it the appearance of a standard world timer, but it's not that either.