1953 Martin D28 "mystery" top: comparison with '53 D18 and '41A

Playing a 1953 Martin D28 Vermont spruce top. Comparing with a '53 D18 Vermont and D28 '41 Authentic (00:00) What do we have here? (03:30) "Mystery" = Vermont spruce (05:30) More about the guitar (09:40) Playing it (14:45) Loose A/B with '53 D18 (22:20) Loose A/B with '41 Authentic (30:30) Loose A/B/C (34:00) Observations (37:45) Tapping backs/tops