Shimano Freewheel Old School BMX 16 Tooth 16t SF-MX30 OG 1990s PL Mid A6

Shimano 16 tooth old school BMX freewheel.  T date code indicates 91, 

 YEARMONTH
A = 1976A = JANUARY
B = 1977B = FEBRUARY
C = 1978C = MARCH
D = 1979D = APRIL
E = 1980E = MAY
F = 1981F = JUNE
G = 1982G = JULY
H = 1983H = AUGUST
I = 1984I = SEPTEMBER
J = 1985J = OCTOBER
K = 1986K = NOVEMBER
L = 1987L = DECEMBER
M = 1988
N = 1989
O = 1990
P = 1991
Q = 1992
R = 1993
S = 1994
T = 1995
U = 1996
V = 1997
W = 1998
X = 1999
Y = 2000
Z = 2001
A = 2002
B = 2003