I like it and it can float and/or rock my boat any day!
When you get back to it...please post a close up of the back side, nails, etc.
Jury is out on the age of this. I know the church I grew up going to (over 130 years old) had window pieces like this.
I agree that it must be one large piece that was trimmed over or put behind the trim work...or they did one heck-of-a-job piecing it! But...if it came from a church (nice building) they would have taken the time to book match it!