The Year by Year Dating Matrix

With Triumph's build records lost when the Works was bombed in November 1940 no one has previously been able to make sense of the three letter dating code/s used after the previous well known TRIUMPH CODEX code. I have been researching this for more than 35 years and one reason why this later code has not made sense is because there was not just one code, but a different code for each year, for the eleven years 1924 to 1934!
The following gives the results of my years of research. The blank months are either months where I have been unable to locate any surviving machines, or months where there had been no production for one reason or another such as strikes within the companies who supplied component parts or materials, or in the case of 1931 there was very little production due to poor sales in the world depression following the American Wall Street Crash of November 1929, and hence no currently known suviving machines.


Year

Code

Jan.

Feb.

Mar.

Apr.

May

June

July

Aug.

Sept.

Oct.

Nov.

Dec.

1924

GH

T

G

O

H

I

-

-

-

D

M

W

S

1925

OR

A

O

T

G

R

H

I

D

E

C

S

M

1926

SA

C

S

M

W

T

A

O

H

G

R

E

I

1927

MT

D

M

C

S

A

W

T

G

O

H

I

R

1928

CO

E

C

D

M

W

S

A

O

T

G

R

H

1929

RM

G

R

H

I

D

E

C

S

M

W

T

A

1930

GT

O

H

G

R

E

I

D

M

C

S

A

W

1931

AW

W

T

A

O

H

-

-

-

-

D

M

C

1932

WA

F

A

W

T

G

O

H

I

R

E

C

D

1933

SS

M

W

S

A

O

T

G

-

H

I

D

-

1934

EC

-

D

E

C

-

-

-

-

-

-

-

-


The Probable Dating Matrix

with the missing months extrapolated from annual patterns, and assuming that 1934 ran for the full year, which is most unlikely.


Year

Code

Jan.

Feb.

Mar.

Apr.

May

June

July

Aug.

Sept.

Oct.

Nov.

Dec.

1924

GH

T

G

O

H

I

R

E

C

D

M

W

S

1925

OR

A

O

T

G

R

H

I

D

E

C

S

M

1926

SA

C

S

M

W

T

A

O

H

G

R

E

I

1927

MT

D

M

C

S

A

W

T

G

O

H

I

R

1928

CO

E

C

D

M

W

S

A

O

T

G

R

H

1929

RM

G

R

H

I

D

E

C

S

M

W

T

A

1930

GT

O

H

G

R

E

I

D

M

C

S

A

W

1931

AW

W

T

A

O

H

G

R

E

I

D

M

C

1932

WA

F

A

W

T

G

O

H

I

R

E

C

D

1933

SS

M

W

S

A

O

T

G

R

H

I

D

E

1934

EC

I

D

E

C

S

M

W

T

A

O

H

G

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