Research help

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New to the forum, so hopefully I am posting this is the correct forum.

Anyways, I have been hanging onto an old "Whistle" sign for quite some time. It has sat in a basement for as long as I can remember. At one point during my childhood my father restored it to, what was most likely his ideal color scheme. I am just trying to find some more information on it. I believe it is an Vintage Pennsylvania Railroad Cast Iron Whistle Sign. As shown in the pictures it does have a few identifying marks. Any information would be appreciated. I will most likely be selling this at some point in time, as I am not a collector.

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