1980s SIGMA Promo "THE BOOK ON SIGMA"





Offering the original SIGMA color promo sheet shown in these photos. Printed on one side only, this promo features a cool photo showing an early Sigma guitar alongside some vintage woodworking tools...."every Sigma is inspected and adjusted by Martin trained craftsmen".. Top edge frayed some. A nice Martin collectible. $12.99 postpaid US


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