I wanted to know where it is.
The only obvious Victoria exchange is in Birmingham. If that is where you mean, or if you mean somewhere near Victoria station in London, we need more info.
If you put a relevant phone number into this checker
that will identify the exchange by its code, and the postcode for cabinet 12 on that exchange can be found, but that is probably approaching the question from where you are rather than where you want to get to.
You may be into finding out where that postcode covers from the Post Office or Royal Mail websites and walking around.
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