From inside (document excerpt):
SERVICE SPARE PARTS LIST SPECIFY MODEL NO. WHEN ORDERING PARTS 20 ” Gas Chain Saw DATE REVISED DATE PAGE MODEL NO. MS2049AVCC / 41CY09AS777 11/18/2004 N/A
WHEN ORDERING PARTS 20 ” Gas Chain Saw DATE REVISED DATE PAGE 38309 N/A 2/2 MODEL NO. 11 12 13 14 15.