NY Doorknob Relic found With Garrett Ace 250

I found this cool doorknob in a small field near where I live about 6-8" down. I don't really remember what it rung up as on my Ace250, but it must have been a pretty good signal for me to go for it at that sort of depth. This area used to be occupied by many Victorian houses (the town dates back to pre-Revolutionary War), but they demolished them in an effort to update the town. My guess is that this is one of the remaining parts of one of those houses. Pretty cool to recover a piece of local history!

Can anyone ID the time period on this thing?