7 lines (6 with data), 252 Bytes

m205a 0 128 0 10:00:00 26/03/1990
# Start time=10:00
# First beat=10:07:29.937
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.531,  <RR-high-limit(sec)>: 0.921
# Note: recording with a timing signal, flutter-compensated