Hamilton 992 help identify please

Need help identifying this watch. Works great looks like it has been professional serviced and repaired on the back cover.It has a bunch of etchings hard to see with the naked eye but they say An=17267, 55452, AF403-5-7-1. Also says 992 21 jewel 5 position 1319666

Serial 1319666 is a 992L, 2nd model, production of this variation started in 1914, the block of serial numbers this piece falls into left the finishing department Aug.16/1918. One of the best railway watches ever, Hamilton made 438,213 of these before it was replaced by the 992B.

Double sunk dial and a gold center wheel too, a nice piece! That watch was designed to run inside 30 seconds a week for years, I bet if still will with a bit of care.

cs