7 lines (6 with data), 248 Bytes

m133a 0 128 0 11:50:00 05/03/1991
# Start time=11:50
# First beat=12:04:56.843
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.484,  <RR-high-limit(sec)>: 0.757
# Note: reel-to-reel recording, not flutter-compensated