You can tell the age if it is post-74.
http://www.leupold.com/hunting-and-shooting/resources/faq/#questionNine9. When was my scope manufactured?
Every Leupold scope produced since 1974 will have a letter included in the serial number acting as a date-code. Scopes using a letter as a prefix (the beginning of the serial number) were produced between 1974 and 1992. Scopes using a letter as a suffix (the end of the serial number) have been produced after 1992. On the chart below, you will notice the letters �I,� �O,� and �Q� have been omitted as they are easily mistaken for �1,� �0,� and �0� respectively.
Prefix: .......Suffix:
E = 1974 .......A = 1993
F = 1975 .......B = 1994
G = 1976 .......C = 1995
H = 1977 .......D = 1996
J = 1978 .......E = 1997
K =1979 .......F = 1998
L = 1980 .......G = 1999
M = 1981 .......H = 2000
N = 1982 .......J = 2001
P = 1983 .......K = 2002
R = 1984 .......L = 2003
S = 1985 .......M = 2004
T = 1986 .......N = 2005
U = 1987 .......P = 2006
V = 1988 .......R = 2007
W = 1989
X = 1990
Y = 1991
Z = 1992
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I don't know of a scope model reference.
Bruce