There was no Igarashi 09, the right name for this motor is Igarashi 05 where 05 actually stands for the size of the can, same as 540 for the Mabuchi.
This was the basic motor, used by most motor makers. The Trinity and Parma motor are based on this Igarashi 05 and looking the same as the original motor beside the painting and stickers. In the beginning the original Igarashi was using a blue endbell, later there had been also black and white versions.
If you got a motor and you´re not sure if it´s based on an Igarashi or Mabuchi motor, there are two facts for easy identification.
All Igarashi based motors are using 4-40 mounting screws, later there had been just the Checkpoint Platinum based can using such screws also but this was a modified motor. All other motors had been using metric M3 scews
Most Igarashi based motors also had the wires directly coming out of endbell where Mabuchi motors used soldering tabs, one exception had been the Igarashi motor made for Ishimasa. And finally most of these motors were completely closed where the Mabuchi motors had two holes at the can for airflow/cooling, but again there had been exceptions with Igarashi motors made for Ishimasa and Sping which used such holes also.
http://classicrc.wordpress.com/motors/sping-2/sping/
But those cooling holes were larger than the Mabuchi holes.
Another example for a very popular motor based on the Igarashi had been the Associated or Reedy 05.
http://classicrc.wordpress.com/motors/reedy/reedy-05-stock/