Help with 1968 Speedmaster

Posts
21,317
Likes
48,490
I think the answers you’ve received have a high likelihood of being correct. But until you actually see it, you don’t truly know what is inside. Best just to have a look.
 
Posts
1,851
Likes
3,578
Anyone knows details about the four digits (in this case 6126) reference which can be found in the american tags and boxes? Are they listed somewhere?
I think they might refer to the product number given in the sales brochure.