Which publishing house has been using the same logo (with minimal modifications) for the longest period of time?

The world of literature isn't just about the words inside books—it's also about the iconic symbols that represent publishing traditions. Some publishing houses have maintained their visual identity for centuries, creating instantly recognizable logos that signal quality and heritage to readers worldwide. Test your knowledge about these enduring symbols of literary brand loyalty and recognition that have stood the test of time.

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Penguin Books (the penguin in oval design, est. 1935)
Oxford University Press (the Oxford shield, est. 1586)
Hachette Book Group (stylized 'H', est. 1826)
Random House (the house illustration, est. 1927)