A cyanotype, of course, and one in unusually good condition. Cyanotypes around 1900 were often created on very thin pieces of paper, and other examples in my collection have been ripped or folded or damaged in some way.Lately the cyanotype method (involving exposure of paper coated with a solution of potassium ferri-cyanide and ferric ammonium citrate to bright sunlight) has been revived by various 'antiquarian' photographers, with sometimes magical results. The odd gay-steampunk duo, McDermott and McGough, are masters of this archaic process: their images look as if they could have been made 120 years ago
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