While there is sadly no audio, someone has posted on youtube the 1977 and also the 1978 Maryland Hunt Cup races.
video (8min) Maryland Hunt Cup - April 30, 1977, 4 Miles
1st - Ben Nevis II, Jockey - Fenwick C Jr
2nd - Perfect Cast, Jockey - McKnight H T Jr
3rd - Moon Meeting, Jockey - Pearce R
4th - Handsome Daddy, Jockey - Fenwick H B
video (11min) Maryland Hunt Cup - April 29, 1978, 4 Miles
1st - Ben Nevis II, Jockey - Fenwick C Jr
2nd - Perfect Cast, Jockey - McKnight H T jr
3rd - Moon Meeting, Jockey - Pearce R
4th - Handsome Daddy, Jockey - Fenwick H B
Is that correct with back to back years with the identical placings 1st through 4th?