Motion valve covers

[JRSully]

I picked up a a pair of Motion valave covers, which were originally chrome (same as the aluminum ones they are selling now. They came with the original Motion emblems cut on botth sides to fit inside the indented box on the valve covers. I have been told that Motion did this when they ran out of the smaller design Motion emblems, they simply cut down the fender emblems to fit the valve covers. I have three questions regarding these if someone can help me out;
1. What year(s) were these sold.?? I was told that the chromed covers were the one's that were sold through the mail and not on the cars themselves (only aluminum covers were put on the cars) the covers have "japan 739" on the inside of them.
2. What is the best way to restore the emblems, does anyone specialize in this.?? They are in very good shape, but want to make them mint. Should I have the original covers rechromed.??? and can anyone recommend a good, reliable chromer.??
3. Does anyone make the breather that was used on these.??

Thanks for your help