Date for these gentlemen please. No restore needed.

[Ruskie]

Just having a second look at this...see at the bottom of the photo, the feet are out of focus and there is a curved effect around the edges...I can tell you that this photo was taken with a very old camera, and a very old lens.
China

Excellent observation.

I don't suppose the v neck cardigan holds any clues? Or the bow tie and braces? 

[Wiggy]

So it is - I hadn't noticed that before!   It almost looks as if it is on glass doesn't it.   
 

[chinakay]

Well, this is getting complicated

Hadn't noticed this was reversed. So it may have been on glass. But more likely a tintype, copied. That would reverse the image, and the colouration of the photo looks more like a tintype.

So, the cardigan.....popularized by the 7th Earl of Cardigan, who led the Charge of the Light Brigade. Early cardigan styles were sleeveless.

I'm going to raise my guess to around 1900.

Ancestrologie, who are these guys anyway? Got a time window for us?

[Ruskie]

So, the cardigan.....popularized by the 7th Earl of Cardigan, who led the Charge of the Light Brigade. Early cardigan styles were sleeveless.

Seems obvious now you mention it. 

[Ancestrologie]

Thank you for the lightening up!
And a really big thank you to all of those who helped with the date. I don't have any clue about who the men could be. It was on my grandmother's things, and definitely not of her uncles, so maybe great uncle, that would put us between 1870 to 1900. This is a strange picture as it's not a tintype, but really looks like it is. The picture is made of a big and soft card. It's pretty the size of a tintype though.

I have a similar picture of my grandfather who participated to WW2, it's on a similar card and the picture is also really dark!