Manufacturing date code matrix

YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
1985 BD BE BF BG BH BJ BK BL BM CA CB CC
1986 CD CE CF CG CH CJ CK CL CM DA DB DC
1987 DD DE DF DG DH DJ DK DL DM EA EB EC
1988 ED EE EF EG EH EJ EK EL EM FA FB FC
1989 FD FE FF FG FH FJ FK FL FM GA GB GC
1990 GD GE GF GG GH GJ GK GL GM HA HB HC
1991 HD HE HF HG HH HJ HK HL HM JA JB JC
1992 JD JE JF JG JH JJ JK JL JM KA KB KC
1993 KD KE KF KG KH KJ KK KL KM LA LB LC
1994 LD LE LF LG LH LJ LK LL LM MA MB MC
1995 MD ME MF MG MH MJ MK ML MM NA NB NC
1996 ND NE NF NG NH NJ NK NL NM PA PB PC
1997 PD PE PF PG PH PJ PK PL PM RA RB RC
1998 RD RE RF RG RH RJ RK RL RM SA SB SC
1999 SD SE SF SG SH SJ SK SL SM TA TB TC
2000 TD TE TF TG TH TJ TK TL TM VA VB VC
2001 VD VE VF VG VH VJ VK VL VM WA WB WC
2002 WD WE WF WG WH WJ WK WL WM XA XB XC
2003 XD XE XF XG XH XJ XK XL XM AA AB AC
2004 AD AE AF AG AH AJ AK AL AM      

NOTE: Serial number lists must be used to determine manufacturing dates on units prior to February, 1985

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