That would hafta be a Martin D28 back in '61 or so. Finally managed to snag a used one (built mid 70's) in 82. Looked the part but parted company with it cause it just sounded crummy mosta the time. VERY disappointed. If I had it these days I would know to take it to a good guitar tech or luthier and have it set up properly-maybe bone nut & saddle and make sure it didn't have an inherent intonation problem. Traded it for a 12 string (Guild). Thing always sounded like it was filled with rags even with new strings. Course now there's a lot more string choices and metal combos--but I don't think it was a string-thing. Now that I think about it, prolly why the guy was willing to sell it to me on the cheap. Told me he just wasn't a "Martin man." Hmmmmmmmmm. (Why'd he buy it then-I was pretty gullible and besides wanted one since I was a kid so I was fixated on the NAME and the look and hardly even played the thing when he got it out from his rec room).