1968 -69 were dark years for Gibson and the Norlin Corporation buy out began. Gibson needed revenue and to use up old parts. Less than perfect tops used to make the J-45 and B-25 were sprayed a solid color of red or black and a few brown . A white screwed down pickguard was used. Many of the instruments were 4 piece tops and marked seconds. Late in 1968 the bridge was reversed with the belly facing down , and the Gibson logo on the pickguard was removed. There is more Gibson Acoustic Flattop Model Information here.