It's a 1969. Suare shoulder j-45 j-50 were made in this configuration, (Gibson pearloid?? headstock inlay, teardrop tortise pg, j-45 or j-50 on trc, belly down adjustable bridge, 25.50" scale, 1.72" nut, no inside sound hole sticker, no inside back seam cover strip.) The serial numbers of the period overlap with the 1968 numbers and were probably constucted or partially built in 1968 and earlier. They were sold in 1969 and 1970 as Diamond Jubilee Models for Gibson's 75th anniversary. The 1970 model has the "Made in USA" stamp below the serial number. 1970 was the first year that Gibson put the stamp on all their guitars.
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