Not too exciting here. I've got a bunch of G. Rosenblatt cancels on other values. All of these cancels are from companies that can be googled and for which information can be readily found. Old insurance company legal proceedings and news clippings may be interesting to some though. What was Concordia's liability from the Great Chicago Fire?
Like I've written before, cancels don't show nearly as well on the gray version of this stamp. These are dated 1899 or 1901. You should never find one dated 1898. The gray colored stamp was not issued until 1899.
The second and third stamps are scans from a stock page, which explains the lines through the center of each stamp.