Die Experten wissen es vielleicht auch nicht so genau?

Angelo - Do you know when Rolex stopped putting mega fat font inserts on GMTs?

Angelo: Nothing definitive, but I would say early 60s, maybe up to 64-65

Some VRF experts who have handles a lot of GMT watches have stated mega fat font inserts are for 60-61 gilt GMTs while others say entire GMT gilt period.

However, the reverse isn't true. Not all gilt GMT in that period had mega fat font inserts.
Quelle: VintageRolexForum.com