I'm of a similar vintage to you, and while the idea of a birth-year guitar appeals, there are very few actual guitars from my birth year which do.
Martins have a rep for being a bit meh in this period, and Gibsons are held in even lower esteem. The electrics from the Norlin era find some defenders, but not many. The acoustics even fewer.
But for you a better birth-year Gibson flat-top might be one in this vein:
MK35
Not exactly a classic either, but more interesting as a piece of design history than a mid-'70s J45. The concept at least gets some respect.
If you like the acoustic sound of mid-'90s Paul Weller, though, you might like a 1970s J45.