Gustav Becker? German Pendulum Wall Clock Westminister Chime, in need of repair?

I am not sure if this is a Gustav Becker, but it does look like one. I have taken as many photos as I can to give an idea of the condition of the clock.

Although it has a key and two spare weights. I'm not sure if it is the right key. we cant seem to turn it. I am afraid to put too much pressure in case I damage it further.

as it stands we dont think it works, but to someone who knows its probably something really simple to get it working.

It belonged to my father in law who was an avid clock collector, so keys could have got mixed up. It worked when he was alive

The chimes work fine, although I think they may need setting properly

if you have any questions feel free to ask.

I would rather buyer collected as it will be difficult to send, However I will arrange a courier on request.

thanks for looking