An rare small English pewter dish or 'spice plate' 15th century

the broad rim with Lombardic lettering possibly 'GAI' or 'T', the bowl with raised circular boss, 'nature's gilding' patina

Generally very good considering great age. The broad rim is uneven as is the booge.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

The presence of 'nature's gilding' would suggest that this piece was an archaeological find. The traces of a gold colour to the surface are a natural oxidisation process that occurs to pieces of a certain alloy and of a great age.

For a related example see The Little Collection, Christie's London, 1st May 2007, lot 105.