It is possible to have decals made, but you need to have a machine in good condition to start with. There are machines for this, and I know it has been done for a single machine. Once someone has made it, it tends to be duplicated. You get the best quality if you get the right guy to do it. The easiest is to use a readily available decal set, but unless you are very lucky I don't think you will find origial Brunswick decals. Given time, patience and money, anything can be done. If you can identify the decal type under all the rust it's at least a start.