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Just acquired this brass Mack plaque I'm assuming it's off a AC it will have a new home hanging on my wall. I'm not interested in selling it but I'm wondering if it's ok to polish it regardless. Any info on exactly what model it is off would be appreciated. Thanks

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Alex

I have the same brass plaque, they are rare pieces it seems. Mine was dull and near black with grime, I have done a gentle clean and now looks similar to your plaque. I tried to polish the back side a bit harder to experiment to see how bright the brass may polish to. It did not/would not come up very bright, so I think it may be the quality of the brass made at that time. I cleaned all the grime from mine and it still has the old patina look. I have thought about giving it a clear coat but decided to leave original, been 1 year now and no change in the patina, has not dulled at all.

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