I have three of the 5m Wilhelm II Speaking at Empire's 25th Anniversary Celebration. I think I have them identified correctly, but would like some more eyes to validate or correct.
Note: I am using Scott Catalog numbers.
As best I can tell this stamp has no watermark. It is 26x17 holes. I have identified as #78. Since this is pre-war, I am assuming it is a sharp impression.

This stamp is 25x17 holes and must therefore be #95 because that is all that Scott lists with this combination of holes. Scott also says this is a wartime printing with indistinct impression. I don't see any watermark, but #95 is supposed to have a watermark lozenges.

This last one is 26x17 holes. It definitely has a watermark lozenges and looks like a more clear impression so I penciled this one in as #95c.

The difference between a sharp impression and an indistinct one is what I am most struggling with on this stamp. Any help would be appreciated.