Are there any more pages, I was hoping there might be some family information, particularly his birthplace.
Also begs the question how do you know it's the correct Michael Keogh.
The photo is interesting, I think you should post it on the Armed Forces and the Photo Restoration boards.
The Armed Forces people would be able to tell quite a bit about the date from the Uniform and possibly the regiment from the cap badge on the younger man's cap, if I've picked up anything over the years here I think these are later WWI uniforms, the older man's uniform is I think a bit strange there is nothing on his cap and his buttons look plain, something not quite right about it to my eye, but I could be talking nonsense.
The photo restoration people would clean it up for you, get rid of all those marks.
