"There's a switch. Will you press it? A coin was hidden inside the collar."
The Collar (首輪 kubiwa) is a key item in Resident Evil.
The Collar can be opened up to reveal the Coin (itself the Imitation of a key).
As suggested by John Toleman in the Crumpled Memo file, the Collar is retrieved from a dog on the Mansion's West terrace.
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