SERIAL NUMBER RECORD 1820 - SERVICE 1 SERIAL NUMBER RECORD p 1820 - SERVICE 1 SERVICE SERVICE SERIAL NUMBER RECORD SERIAL NUMBER RECORD Record serial numbers and date of purchase in spaces provided. Serial number plate is mounted on model plate under flaps, as shown. Record serial numbers and date of purchase in spaces provided. Serial number plate is mounted on model plate under flaps, as shown. om1635 om1635 Date of purchase Serial number Engine serial number Date of purchase Serial number Engine serial number