I would suggest checking the solder joints are they clean. With this in mind remember if the last two digits of the source date code are greater than 52 you re not looking at the source date code dating gibson electric guitars. Note the use of 550 as a source code on these products. Gibson didn t start using pots with source date codes till 1953 or 1954 dating gibson electric guitars.
In terms of a guitar this instrument is at the top of its class. The classic dreadnought lines the sunburst design and the high quality craftsmanship behind it have made this guitar an indispensable instrument for countless musicians. But where does that leave everyone else. The source date codes are under the framework of the electronic industries association which is a non profit organization representing the manufacturers of electronic parts.
In this case the speaker is made by rola 285 in the 9th week of 1957 709 . National valco supro amplifier products. Gibson prides itself on making guitars that players want to play.The sitka spruce tops exhibit a beautiful grain against which the sunburst design is placed.
It may have been some time before the part was installed at the factory but it still provides a good approximation of when the gear was made.