Thanks Greg, Ricky, Mike amd Mark...
Greg and Mark, your memories are flawless!  
The following year on April 30, 1969 Jim Maloney pitched his 2nd career no-hitter against the visiting Houston Astros, defeating them 10-0.
The very next day Astro fireballer Don Wilson duplicated the Perry Washburn back-to back no-hitter feat from a year earlier.  Don Wilson also pitched his 2nd no-hitter against the hometown Reds 4-0 in front of another incredibly small crowd.  Only 4,400 attended Wilson's masterpiece.  After searching for this ticket for 39 years, I also finally found it in 2011.  
 
NOTE: Wilson's life ended suddenly at age 31 in 1974 when he died of carbon monoxide poisoning.  
BTW, the only other time that back-to-back no-hitters occured in ML history was in 1917 when Ernie Koob and Bob Groom did it in St. Louis.
Sorry, I don't have either of these to show! 
