Trench or rail track dial, both the same but only seen in the 14381 and 14393 references. The 14393 is a 561 with date the 14381 is a cal 551 without date but AFAIK the case design is the same.
I´m sure
@JohnSteed was only highlighting the ´buy now with haste, regret later at leisure´ nature of this poor watch!
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