For information:
PRE-UNIT 5T Speedtwin was made up to 0200074 - 28/08/1958.
The T100 was made up to 030424 - 25/10/1959.
All these were SINGLE DOWN tube, NO DUPLEX 500s' were built.
The first UNIT 5TA Speedtwin was H5785 - 25/09/1958.
The first UNIT T100 was T100A H11512 - 01/10/1959.
So, history tells us that BOTH pre AND unit ran together. Roy
