Vintage Welby 8 Day Cannonball Clock Mid Century -Germany-Works-with

This cannonball clock features a Welby 8 day clock made in Germany that runs fine. I have have timed it for the last 25 hours and it is running 30 seconds slow. I have not tried to adjust. I don't know enough about clocks and don't want to affect it. The cannonball seems to have been made and the clock placed in it. I have removed for pictures and also needed to replace a few screws. I have replaced all of the screws but have included the 2 that remained with the clock. The screws don't have a great tight fit. Some are better than others. May need to fix holes. The key appears to be original but I'm not an expert so not sure about that. Included are the chain and a wall or ceiling mount that it would hang from. The cannonball weighs approximately 17 pounds. It measures 15" from top of mounting ring to bottom brass tip. They appear to be brass but not sure. It is approximately 2' 10" around. The clock face is 5" across and about 2 1/2" front to back. The wall/ceiling mount is about 14" tall and 11" across. It is 7/8-1" wide.The chain is 12" long and the key is 1 3/4" tall and 1 7/8" wide at the turning key.