that paper bill peso... compare your bill with these...Ebay link: http://www.ebay.com/sch/Paper-Money...R40&_nkw=Mexico+Chihuahua+1+peso+1915&_sop=15
I was never into Pesos nor $19 Franklins half's but I wouldn't mind getting my hands on some $50 Ike's.
Your references to other collector's have questioned the boundary's. Kind a like taking advantage of a new collector, Un acceptable, INMHO
the 3 coin picture down is Vatican City, 1993, KM#243, 500 lire denomination, metal- .835 silver, 2016 krause world coin catalog grade/value XF40-$25.00 MS60-$35.00 MS63-$40.00 going to guess yours is at least MS63