Catalogue covers:
Series 1: serial numbers start with header size eg: 35996*** = 35Ft
Series 2: serial numbers start with 8
Series 1 only available in 25 / 30 / 35 ft
Series 2 available in 16 / 18 / 20 / 22 / 25 / 30 / 35 / 41 ft
Nb: serial number ranges reset when changed to series 2 models. Eg code 096 is actually later that 996
Serial numbers details as below
3050CG-16 - 16FT (4.9Mtr) (serial numbers begin 818)
3050CG-18 - 18FT (5.5Mtr) (serial numbers begin 828)
3050CG-20 - 20FT (6.1Mtr) (serial numbers begin 838)
3050CG-22 - 22FT (6.7Mtr) (serial numbers begin 848)
3050CG-25L* - 25FT (7.6Mtr) * light version (serial numbers begin 25 (series 1) or 858 (series 2))
3050CG-25 - 25FT (7.6Mtr) (serial numbers begin 25 (series 1) or 858 (series 2))
3050CG-30 - 30FT (9.2Mtr) (serial numbers begin 30 (series 1) or 868 (series 2))
3050CG-35 - 35FT (10.7Mtr) (serial numbers begin 35 (series 1) or 878 (series 2))
3050CG-41 - 41FT (12.5Mtr) (serial numbers begin 888)