Help Identifying Several Stamps

Looking closely at my ~300 Germania's, I have come to the conclusion that the paper is confusing.

Scott number 100 (15 pf violet with lozenge watermark) seems to come in 2 paper varieties, a very pale white that is almost chalky, and a more tan white. The watermark is hard to see (upon shining a light through the reverse) on the first, but extremely easy to see on the second.



I see this also with my 5 pf reichspost and 10 pf reichspost.

The 50 pf DR seems to come mostly (3/4 stamps in 3 different collections) on a slightly greyish paper, as well as the usual tan.

The 4 M also comes in greyish paper in my only example. I'll try to do a comprehensive comparison between my Germania's (in 7 different books plus 1 postcard) soon.

here you explanation, booklet of those stamps = different paper

That would do it. I never thought that different denominations would be printed on the same sheet.