CHERRY PRODUCTION SCHEDULE
The serial number can be found on the bottom of keyboard.  The last three (3) digits of the serial number are a letter and 
two numbers.  The letter indicates the year the keyboard was manufactured; the two numbers indicate the week. 
A - 1988 F - 1993 K - 1998 P - 2003 U - 2008
B - 1989 G - 1994 L - 1999 Q - 2004 V - 2009
C - 1990 H - 1995 M - 2000 R - 2005
D - 1991 I - 1996 N - 2001 S - 2006
E - 1992 J - 1997 O - 2002 T - 2007
2009 Date Code Calendar
JANUARY FEBRUARY MARCH APRIL
S M T W T F S S M T W T F S S M T W T F S S M T W T F S
1   1 2 3 6 1 2 3 4 5 6 7 10 1 2 3 4 5 6 7 14 1 2 3 4
2 4 5 6 7 8 9 10   7 8 9 10 11 12 13 14 11 8 9 10 11 12 13 14 15 5 6 7 8 9 10 11
3 11 12 13 14 15 16 17 8 15 16 17 18 19 20 21 12 15 16 17 18 19 20 21 16 12 13 14 15 16 17 18
4 18 19 20 21 22 23 24 9 22 23 24 25 26 27 28 13 22 23 24 25 26 27 28 17 19 20 21 22 23 24 25
5 25 26 27 28 29 30 31 14 29 30 31 18 26 27 28 29 30  
MAY JUNE JULY AUGUST
S M T W T F S S M T W T F S S M T W T F S S M T W T F S
18 1 2 23 1 2 3 4 5 6 27 1 2 3 4 31 1
19 3 4 5 6 7 8 9 24 7 8 9 10 11 12 13 28 5 6 7 8 9 10 11 32 2 3 4 5 6 7 8
20 10 11 12 13 14 15 16 25 14 15 16 17 18 19 20 29 12 13 14 15 16 17 18 33 9 10 11 12 13 14 15
21 17 18 19 20 21 22 23 26 21 22 23 24 25 26 27 30 19 20 21 22 23 24 25 34 16 17 18 19 20 21 22
22 24 25 26 27 28 29 30 27 28 29 30 31 26 27 28 29 30 31 35 23 24 25 26 27 28 29
23 31 36 30 31
SEPTEMBER OCTOBER NOVEMBER DECEMBER
S M T W T F S S M T W T F S S M T W T F S S M T W T F S
36 1 2 3 4 5 40 1 2 3 45 1 2 3 4 5 6 7 49 1 2 3 4 5
37 6 7 8 9 10 11 12 41 4 5 6 7 8 9 10 46 8 9 10 11 12 13 14 50 6 7 8 9 10 11 12
38 13 14 15 16 17 18 19 42 11 12 13 14 15 16 17 47 15 16 17 18 19 20 21 51 13 14 15 16 17 18 19
39 20 21 22 23 24 25 26 43 18 19 20 21 22 23 24 48 22 23 24 25 26 27 28 52 20 21 22 23 24 25 26
40 27 28 29 30 44 25 26 27 28 29 30 31 49 29 30 1 27 28 29 30
Numbers in blue follow the production week code above
Keyboards have a 3-year manufacturer warranty (if issued beyond T20) from date of production year, then week, with a few weeks allowance for shipping.
Keyboards have a 2-year manufacturer warranty (if issued prior to T19) from date of production year, then week, with a few weeks allowance for shipping
Proof of purchase can also be provided for warranty claim