Rhode Island is 2709 km2
Monaco is 2 km2
Guam is 549 km2
Singapore is 692 km2
Andorra is 468 km2
Liechtenstein is 160 km2
Luxembourg is 2586 km2
Hong Kong is 1092 km2
So Saxe-Coburg and Gotha was one of the larger small countries in Europe at the time - roughly comparable to Luxembourg today.
And in terms of importance relating to the diplomatic recognition of the Confederacy it rates no more,at best, to a footnote in history, a trivial pursuit question.