Nice set. I see you have two tough ones left to get, the 1921's. Minor correction to your title. They are Walking Liberty halves. Standing Liberty coins are the quarters, 1916-1930
These are Walking Liberty Half Dollars. A nice clean circulated set. The two missing was can be found for about $75.00 each in this condition, a lower grade can be had for around $50.00 each.
I sold a G/VG 1921 D with a rim dent for $125 a couple years ago. The going rate for problem-free was around $175. I’m glad it sold before the price collapse.