Anna,
There is no direct correlation between the narrow/wide grip safety and the thumb safety type. Grip safeties change from narrow to wide between sn 9855 and sn 10010. Thumb safeties vary between type-1 and type-2 (in some distinct ranges) until sn 10235 where they become all type-3. Types 2 and 3 are intermixed between sn 10010 and sn 10192.
--Dwight
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