it adjusts the tension on the spool itself
Ake Murvals private notebook from the Ambassadeur 5000 project states this about the color test reels (I prefer to call them the Record Ambassadeur 5000 Type 1 - "First model made in several colors, not for public sale and prior to January 1952): They are all made in 1951 between May and October (5 reels made in May, one each color 60 reels made in November/October, 20 in red, green and black)
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Titanium alloy guides with SIC inserts create a lightweight, balanced blank design
I guess traveling fisher-people are just fine with oversized rod tubes and exorbitant extra baggage fees because it makes sense I should pay the same amount to bring my fishing rod on board an airplane as someone trying to fly with their surf board or bicycle