Dinosaur key

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Of the 3-4 years of key collecting this key is one of the most fun and interesting I have come across.

Does anyone have any idea what this key is for? I wondered if it was a special key to the British museum maybe? It certainly show the key has had some usage and I would say 19th century? I’ve given it a clean just to remove the majority of thick rust that had covered it. The dinosaur end is very heavy with matching dinosaur each side and makes the key very impractical especially as you couldn’t attach it to anything.

Any info appreciated.