————————————————————————————————————–

Serial numbers are now on the lower left of the head tube, by the Schwinn badge on front of the frame

————————————————————————————————————–

Numbering system:

The first letter is the month, the second letter is the year.
I and O are skipped so as to avoid confusion with 1 and 0.Examples:
AF***** = Jan. 1970,….. (“A” = Jan., “F” = 1970)
GL***** = July. 1975,….. (“G” = July., “L” = 1975)
MR***** = Dec. 1980,….. (“M” = Dec., “R” = 1980), etc.
—————————————————————————————————————

(1970)

JANUARY, —————————- AF*****
FEBRUARY, ————————– BF*****
MARCH, ——————————- CF*****
APRIL, ——————————— DF*****
MAY, ———————————– EF*****
JUNE, ———————————- FF*****
JULY, ———————————- GF*****
AUGUST, —————————– HF*****
SEPTEMBER, ————————- JF*****
OCTOBER, ————————— KF*****
NOVEMBER, ————————- LF*****
DECEMBER, ————————- MF*****

(1971)

JANUARY, —————————- AG*****
FEBRUARY, ————————– BG*****
MARCH, ——————————- CG*****
APRIL, ——————————— DG*****
MAY, ———————————– EG*****
JUNE, ———————————- FG*****
JULY, ———————————- GG*****
AUGUST, —————————– HG*****
SEPTEMBER, ————————- JG*****
OCTOBER, ————————— KG*****
NOVEMBER, ————————- LG*****
DECEMBER, ————————- MG*****

(1972)

JANUARY, —————————- AH*****
FEBRUARY, ————————– BH*****
MARCH, ——————————- CH*****
APRIL, ——————————— DH*****
MAY, ———————————– EH*****
JUNE, ———————————- FH*****
JULY, ———————————- GH*****
AUGUST, —————————– HH*****
SEPTEMBER, ————————- JH*****
OCTOBER, ————————— KH*****
NOVEMBER, ————————- LH*****
DECEMBER, ————————- MH*****

(1973)

JANUARY, —————————- AJ*****
FEBRUARY, ————————– BJ*****
MARCH, ——————————- CJ*****
APRIL, ——————————— DJ*****
MAY, ———————————– EJ*****
JUNE, ———————————- FJ*****
JULY, ———————————- GJ*****
AUGUST, —————————– HJ*****
SEPTEMBER, ————————- JJ*****
OCTOBER, ————————— KJ*****
NOVEMBER, ————————- LJ*****
DECEMBER, ————————- MJ*****

(1974)

JANUARY, —————————- AK*****
FEBRUARY, ————————– BK*****
MARCH, ——————————- CK*****
APRIL, ——————————— DK*****
MAY, ———————————– EK*****
JUNE, ———————————- FK*****
JULY, ———————————- GK*****
AUGUST, —————————– HK*****
SEPTEMBER, ————————- JK*****
OCTOBER, ————————— KK*****
NOVEMBER, ————————- LK*****
DECEMBER, ————————- MK*****

(1975)

JANUARY, —————————- AL*****
FEBRUARY, ————————– BL*****
MARCH, ——————————- CL*****
APRIL, ——————————— DL*****
MAY, ———————————– EL*****
JUNE, ———————————- FL*****
JULY, ———————————- GL*****
AUGUST, —————————– HL*****
SEPTEMBER, ————————- JL*****
OCTOBER, ————————— KL*****
NOVEMBER, ————————- LL*****
DECEMBER, ————————- ML*****

(1976)

JANUARY, —————————- AM*****
FEBRUARY, ————————– BM*****
MARCH, ——————————- CM*****
APRIL, ——————————— DM*****
MAY, ———————————– EM*****
JUNE, ———————————- FM*****
JULY, ———————————- GM*****
AUGUST, —————————– HM*****
SEPTEMBER, ————————- JM*****
OCTOBER, ————————— KM*****
NOVEMBER, ————————- LM*****
DECEMBER, ————————- MM*****

(1977)

JANUARY, —————————- AN*****
FEBRUARY, ————————– BN*****
MARCH, ——————————- CN*****
APRIL, ——————————— DN*****
MAY, ———————————– EN*****
JUNE, ———————————- FN*****
JULY, ———————————- GN*****
AUGUST, —————————– HN*****
SEPTEMBER, ————————- JN*****
OCTOBER, ————————— KN*****
NOVEMBER, ————————- LN*****
DECEMBER, ————————- MN*****

(1978)

JANUARY, —————————- AP*****
FEBRUARY, ————————– BP*****
MARCH, ——————————- CP*****
APRIL, ——————————— DP*****
MAY, ———————————– EP*****
JUNE, ———————————- FP*****
JULY, ———————————- GP*****
AUGUST, —————————– HP*****
SEPTEMBER, ————————- JP*****
OCTOBER, ————————— KP*****
NOVEMBER, ————————- LP*****
DECEMBER, ————————- MP*****

(1979)

JANUARY, —————————- AQ*****
FEBRUARY, ————————– BQ*****
MARCH, ——————————- CQ*****
APRIL, ——————————— DQ*****
MAY, ———————————– EQ*****
JUNE, ———————————- FQ*****
JULY, ———————————- GQ*****
AUGUST, —————————– HQ*****
SEPTEMBER, ————————- JQ*****
OCTOBER, ————————— KQ*****
NOVEMBER, ————————- LQ*****
DECEMBER, ————————- MQ*****

(1980)

JANUARY, —————————- AR*****
FEBRUARY, ————————– BR*****
MARCH, ——————————- CR*****
APRIL, ——————————— DR*****
MAY, ———————————– ER*****
JUNE, ———————————- FR*****
JULY, ———————————- GR*****
AUGUST, —————————– HR*****
SEPTEMBER, ————————- JR*****
OCTOBER, ————————— KR*****
NOVEMBER, ————————- LR*****
DECEMBER, ————————- MR*****

(1981)

JANUARY, —————————- AS*****
FEBRUARY, ————————– BS*****
MARCH, ——————————- CS*****
APRIL, ——————————— DS*****
MAY, ———————————– ES*****
JUNE, ———————————- FS*****
JULY, ———————————- GS*****
AUGUST, —————————– HS*****
SEPTEMBER, ————————- JS*****
OCTOBER, ————————— KS*****
NOVEMBER, ————————- LS*****
DECEMBER, ————————- MS*****

(1982)

JANUARY, —————————- AT*****
FEBRUARY, ————————– BT*****
MARCH, ——————————- CT*****
APRIL, ——————————— DT*****
MAY, ———————————– ET*****
JUNE, ———————————- FT*****
JULY, ———————————- GT*****
AUGUST, —————————– HT*****
SEPTEMBER, ————————- JT*****
OCTOBER, ————————— KT*****
NOVEMBER, ————————- LT*****
DECEMBER, ————————- MT*****————————————————————————————————-

During the 1980s, Greenville used the old letter-digit
(e.g. F8 = June 1988) system which Chicago stopped using in 1965,
changing to the two-letter system.For newer bikes:
there’s a 4 digit serial number lightly stamped onto the headbadge.
The first three digits are the numerical day of the year,
and the last digit is the last digit of the year.

Example:
3654 is 12/31/84 or 94 or (?).