1882 $50 BB F+ National Bank of Denver Colorado.
Charter # 1016 Serial # 7583
New to the census and only the 3rd 1882 BB $50 note known.
An extremely rare type and denomination from Colorado, with this new addition to the census raising the total of $50 Brown Backs reported from all Colorado banks combined to eight. One example of the note is off the market forever in a major institutional holding. Not a single Colorado $50 Brown Back has appeared at public sale since the massive collection of Frederick Mayer was sold back in 2008.
This  note is much nicer than the one that sold for $5287 at Heritage Auctions in January 2016.
Out of the 3 known notes this is possibly the finest.