7 lines (6 with data), 248 Bytes

m266a 0 128 0 15:30:00 30/09/1989
# Start time=15:30
# First beat=15:30:00.437
# <age-range>: 65-69, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.453,  <RR-high-limit(sec)>: 0.679
# Note: reel-to-reel recording, not flutter-compensated