Has anyone seen the military markings below. It has the Broad Arrow then:
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I.T.D.
No. 500

I have included a photo. I have searched through my sources and can not find anything on this.

I don't know. Could you please post of photo of the dial, and possibly also the movement? The broad arrow symbol says it is definitely British, though this includes not only the UK but also all of the empire country forces as well. If it were just the letter 'I' it would likely be for the India army use. ITD could mean many things. Hopefully someone will know. The No. 500 just means that it is serial number 500. There is no way to tell how many were made and issued other than it was at least that many but it could have been a great many more.

Dial

Movement

Interesting markings. Being a pin-set, the watch would appear to be of pre-WWI vintage. I don't see the combination of letters in THE BROAD ARROW by Skennerton. The "I" could stand for Irish, Infantry, India, etc. To make things even more interesting, military schools and training centers also had markings, some of which are not well known.

The possibilities are endless:

the I might be a 1 and it could be the 1st Tank Division or the 1st Training Division, or it could be the letter I and be the India Telegraph Division, or the Infantry Training Department, or so many other things. I have never seen a listing of all of the markings on the back of British Army watches - it seems to be a very large variety though. If anyone ever comes across a Rosetta Stone for these markings I would love to see it posted here.

Thank you very much for the assistance. I saw this item in a listing that sold a little while ago. The watch came in a wooden stand up box with a viewing portal to the watch face. It also had the marking "No. 500" branded on the rear of the box. Thank you so very much for your input. I am always curious to learn new markings. Thanks again.

Since you mention it was in a wooden box with the dial visible, it may have been a message center timepiece of some kind. Many armies used timepieces mounted in wooden boxes or frames of various designs in message centers so incoming and outgoing telegraph and telephone messages could have exact times noted. If that is the case the T might stand for telegraph or telephone?

That would make it a very interesting timepiece to own. To bad it was not me! Thanks again for your further input. Mike