Brief history rockford watch company the highest grades of early rockford watches were signed ruby or ruby jewels rockford serial numbers and production . Rockford watch co rockford in five different grades by 1877 the company was producing 3 4 grade and serial numbers with production figures . Abebookscom rockford watch company grade and serial numbers with production figures 9780913902110 by roy ehrhardt and a great selection of similar new . Rockford watch company grade and serial numbers with production figures by roy ehrhardt heart of america pr 1978 06 spiral bound good
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