7 lines (6 with data), 247 Bytes

m003a 0 128 0 10:00:00 24/05/1990
# Start time=10:00
# First beat=10:05:26.625
# <age-range>: 70-74, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.578,  <RR-high-limit(sec)>: 0.89
# Note: reel-to-reel recording, not flutter-compensated