7 lines (6 with data), 252 Bytes

m130a 0 128 0 12:50:00 19/03/1989
# Start time=12:50
# First beat=12:58:21.312
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.632,  <RR-high-limit(sec)>: 1.171
# Note: recording with a timing signal, flutter-compensated