[springer]

Your GMT seems to be in nice condition for its age. That it is a very early GMT 1675 with the Mark 0 dial and the small 24-hour red hand. Those early dials had zinc sulfide tritium which is evidenced by a greenish glow when placed under the UV light.

As far as the bezel spring goes, someone bent your bezel spring at the four positions. They probably thought it would help tighten-up the bezel. Factory bezels are flat but it is not unusual to find one that has bent in two positions, or in four positions like your insert.