@zak99b5 just to add to your comment on the model# 635 style 620 super bowl board (615 and 618 are included even though 620 is not on the board is the same build style but are smaller), the 620 became stylized as to the design build not the model number, so all boards after the 620 natural end zone fields had a model# and 620 was the style design build, the 660's came in 2 sizes the older big board model# 660 style 620 build design and the smaller 660 (identifiable at a glance does not have the Tudor star logo only super bowl on the side rail) which is around 2.5in. shorter, model#610 AFC is a 620 style, model#650 NFC is a 620 style, model# 627 is a 620 style, model# 633 is a 620 style, model# 645 is a 620 style, model# 655 is a 620 style, all based on the 620 frame design.
the only boards not using the design minus the Model#600 fiber are pan type builds which are one piece stamped Model#500 model#510 model#520 etc.. and the miggle toy super bowl game..