Hi, I bought this sign and was wondering what is the best way to try restore it. The sign is 32 x 32 inch and 3/4 inch thick slate and very heavy. should the slate be painted, and has anyone got a picture of the trade mark for colours. I have seen other slate signs which have glass on the front would this have been the same or is it too big. And has anyone got any idea as to the age of the sign. Any info would be very welcome. Thanks