Nov. 16th, 1971 the 7th issue, "Sports & Sightseeing"
Designed by James P. Frackrlton, MD.
The .25 stamps are alternating withh the lettering "Perry's Monument" & "Sightseeing". On the single set you would receiver 4 stamps. But, all other combinations (pairs/PB's/half/full sheets) will just receive the standard 3 sets.
 
RSI 43 - .05 cent stamp - "Two Ladies Fishing" - Perf Stamp
RSI 44 - .10 cent stamp - "Island Tennis Court" - Perf Stamp
RSI 45 - .25 cent stamp - "Perry's Monument" - Perf Stamp
RSI 46 - .25 cent stamp - "Sightseeing" - Perf Stamp
The Imperf set is Catalog Numbers RSI 47-50