Can anyone help me to identify the markings on the back of my newly acquired West End Watch Company wrist watch?

The ebay listing didn't show a photo of the movement, so I just rolled the dice. I think I hit a homerun! Movement was supplied to West End Watch Co. by Thommen. It is pictured on page 120 of the Paulson “Master Key” (Paulson #24804).

Here is a shot of the dial. Almost perfect except for a little flea bite on the edge between 10 and 11 o'clock.

Nice watch, it´s an early wristwatch issued to the troops in India:
West End
Use the search fuction for West End, you´ll find all you need!

Werner, thanks for the info. In all my research today, I still can't find what the SS stands for on the back of the case. I found that the vertical arrow with the "I" below it stands for India, but still can't nail down the "SS." I tried multiple types of Google searches, but came up with nothing. Any thoughts on what the SS stand for?

To be honest, I don´t know either.
There´s a PDF on the net called "Guide to military timepiece markings", it´s out of the book " Military Timepieces" by Z. M. Weslolowski, where all that is said ; Service wristwatch mark, Indian Army Ca.1930...which can´t be right either, because I have a few old Pocketwatches with those marks on!
and I have older pieces like your own, that were issued before 1930.
Here´s the Link; Guide to military markings

An educated guess regarding the "S" and "S S" markings found on British & Commonwealth military watches is that they indicate a watch sold out of service. Maybe to the man to whom it was issued? A little more research may be needed to be sure of this theory, but so far it seems to fit.

I can´t conform with your guess Greg, if the S or SS markings were to indicate the watch was sold out of service, then why have no watches ever appeared with just the "I" for India on?
A little more research is indeed needed!

Yes, good point Warner. We will keep working on this one.