Under tab, "Shipfitter Shop" Printing on bottom states, "Shop XII Extension" Printing on back states, "Construction of Extension to Machine Shop, Building 3"
Under tab, "Shop Extensions" Printing on bottom states, "(1) Non-Classified (2) EST-1489 (3) Charleston Naval Shipyard, Charleston, South Carolina (4) 10 September 1961 (5) Extension to Machine Shop and Hydraulic Repair Facility (6) Not Applicable (7) South and WEst Walls (8) Looking Northwest (9) NBy-31328 (10) NBy-EST."