I do not know how I missed this post - what an impressive assembly of 1794 Large Cents you have. My sincere gratulations to you. I am sure it took quite a while (years I am sure) to put it together.
The two heads of '93 are very nice. To find them with significant reverse detail, like yours, is not easy. My one and only example (the most 'common' S18-b lacks any reverse detail).
I only have 8 examples of 1794's in my collection. 7 of them found in Europe.
Do you focus solely on 1794?