1920's pocket watch help

[AP1875]

Hi, my friend just dropped round with a pocket watch he wants me to take a look at it. At first I thought he meant it just needed a service, but it is in pretty bad shape so I thought I'd ask here for some advice on how to approach this.

Can anybody identify the model from the pictures? I've looked online and I can see similar watches but not this one. It seems to be some sort of Dennison. I googled the markings A.L.D 267080. Movement says Swiss made 17 jewels and doesn't look too different to a 6497.

Will parts be available for this? Its missing a crystal, minute hand and at first glance you can see the hairspring is damaged

The watch has been passed down through the family. It says on the back 'from mother on his wedding morning August 4th 1924' . It now belongs to his mother who is not too well and would like to get it working to give back to her.

So before I take it apart, I'd just like some advice on how to approach this.

Thanks guys

[StuartBaker104]

Firstly, 7 jewels not 17! And it looks like at least 2 of them have gone awol, from the balance cock.

It's a 9ct Dennison case, and as often happened in those days, the movement quality is somewhat lower than the case. When buying a watch, you chose the case and probably took the retailers advice on which movement to have fitted.

The hairspring is a bit mangled. I can't see if the stud is still attached or if it has broken off. If the former then with time and a sense of humour you stand a chance of re-shaping it.

There appears to be a movement makers mark next to the winding wheel which I can't read... possibly Buren?

If you can find a calibre number - maybe under the dial, then I would try to track down a spare movement from eBay to use as a donor as you will struggle to track down the jewels.