Germany's Germania issues of 1900-1922 can, at first glance, be a real pain to identify. To help in this regard, I've put together a little tool that allows you to filter the Germania issues by face value, watermark, and type, to narrow down the potential catalog numbers.
Give it a try
here.
As it's early in the development, there are a couple in-work items --
(1) A handful of the photos are representatives, not actuals -- meaning, if two catalog numbers (say, #68 and #83) are identical except for the watermark, they may have the same photo (in this case, #68). I have photos of most of the actual issues, but they're on a boat to the Azores at the moment, so I had to make do with what's available on the Internet.
(2) I'm working on adding the larger issues, and some more specialized items. There are a lot of minor variations, and I may eventually add them all, but for now it's just the basics to get you in the ballpark.
As always, feedback is appreciated.