7 lines (6 with data), 248 Bytes

m279a 0 128 0 16:35:00 15/04/1988
# Start time=16:35
# First beat=16:52:53.765
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.507,  <RR-high-limit(sec)>: 0.906
# Note: reel-to-reel recording, not flutter-compensated