What Does the "W" Mean on an NGC Proof Slab

[PF70UC-migration]

I have seen coins designated in a few different ways utilizing the W designation.

 

1) Example: PF69 W Cam - Does that mean coin is a proof 69 with cameo or is there other significance.

 

2) Example: 1969 25C Washington Cameo PF69

 

3) Example: 1959 5C Jefferson PF69 W - no reference to a cameo designation that I can see.

 

Any help with an explanation would be sincerely appreciated. Thanks.

[DWLange]

For a brief time NGC used the designations W and T to denote coins that were either "white" or "toned." A re-evaluation of this policy caused it to be dropped at a later date.