There are a lot people out there who are wondering how to restore artwork on old machines. The advantage of these old machines is that the decorations are usually relatively simple. They use a limited number of colors and the colors most of the times are solid.
Your best choice is vectorizing the artwork.
Why to use vector software:
This makes it possible to scale the image without losing quality.
You can use layers for different parts of your drawing so you can hide or lock stuff you aren't working on .
You can keep tweaking till it's just right.
The software I prefer is Adobe Illustrator, but as this is extremely expensive I looked for a good alternative. Then I stumbled across Inkscape. A free and open source project.
The look isn't as professional but the feel is the same.
If you are used to working with Illustrator you can easily make the switch. If you have to start learning vectorizing this program is a blessing. All icons have self explanatory look, and if you hover over them you get a nice info box (you can chose from alot of laguages on there site). All stuff I use for vectorizing artwork are right there.
If you save your work as .EPS or .PDF you van take the file to your local print shop for professional printing.
The software can be found here:
Maybe we can use this topic to exchange tips and tricks about vectorizing.