7 lines (6 with data), 248 Bytes

m267a 0 128 0 10:30:00 12/09/1989
# Start time=10:30
# First beat=10:30:00.718
# <age-range>: 65-69, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.578,  <RR-high-limit(sec)>: 0.992
# Note: reel-to-reel recording, not flutter-compensated