Hi Renden. I don´t know if it´s useful to you, but the german Michel specialized catalogue shows the following types of overprintings:
Type I: Fat script, 10,7 mm long, without control mark under bar.
Type II: Script as type I, with short control mark under bar.
Type III: small script, 10,5 mm long with short/ thin control mark under bar.
The control mark may be absent or just partial on stamps of type III
