Beginning in 1973, Lochinvar started using a letter year followed by a letter month, excluding certain letters.
Letter years:
A - 1973
B - 1974
C - 1975
D - 1976
E - 1977
F - 1978
G - 1979
H - 1980
J - 1981
K - 1982
L - 1983
M - 1984
N - 1985
P - 1986
S - 1987
T - 1988
W - 1989
X - 1990
Y - 1991
Z - 1992
A - 1993
B - 1994
Letter months:
A - Jan
B - Feb
C - Mar
D - Apr
E - May
F - Jun
G - Jul
H - Aug
J - Sep
K - Oct
L - Nov
M - Dec
So I believe you have an August 1994 unit. Now if you were here in San Diego—where I quite often find water heaters from the 1960s and 1970s, still going strong—you might have an August 1974 unit. You would have to evaluate other clues (ANSI date, house build date, etc.) to arrive at the date of manufacturer.
But since you’re in Wisconsin, I believe you have an August 1994 unit.