Why not from factory? If I think about it:
1. Against the style of the dash, overall aesthetics of the 60-es, simple geometric, slim, pure, functional, modern. Type emblem would not bring anything, just disturb the flow.
2. Cost - cost of emblem itself, but also not so easy fitting, given the double layered glove compartment lid. Not sure if the same as radio delete emblem could be used (due to the way of fitting it, there was no double sided self adhesive tape as today), which would mean another SKU in parts for, actually, no apparent reason.
Just my thoughts.