Nice to see a somewhat uncommon series posted on the forum from time to time. Especially when it's from a new member. Welcome! A pleasing example you have there. As for myself, only three but not proofs. An 1866, 67 and 68. Some day I'll resume this series.
I started working on a circulated set several years ago and intended to work on proofs when completed. Life got in the way and my circulated pieces have been sitting in the safe deposit box long enough that I don't even know how many or what years I have.