I recently picked-up another used copy of Sieger I from auction. At the time I bought the first of my used copies, I was told there were only three known used copies. I have since bought two that were previously unknown, raising the number of known copies (at least to me, and to two of the auctionhouses I've bought from) to five, of which I now own three.
Here's the newest one, used at Stuttgart No. 1 post office, 23 March 1914.

And the new version of the album page:
