Antique Shingle Nail HP Garage Landmark Birthplace Silicon Valley COAAntique Shingle Nail HP Garage Landmark Birthplace Silicon Valley COA Nail and Shingle from the HP House and Garage with COA COA with 4 signatures Garage declared California state landmark in 1987 Birthplace of "Silicon Valley" 367 Addison Avenue, Palo Alto California, USA Limited. Number 34 of 140 Dimension of frame 11" x 9" x 3" Excellent condition, very well preserved with minimal handling wear Please see photos Combined shipping is available