[8] The angular and calligraphic style of writing prevalent to its west is not found in this development.

It developed on its own in Kamarupa, till the Nidhanpur copper-plate issued by Bhaskarvarman from his military camp at Karnasubarna, which took on Kutila characteristics.

The scripts of the 5th-century Umachal and Nagajari-Khanikargaon rock inscriptions are nearly identical to the eastern variety of the Gupta script,[13] which over the centuries evolved into the proto-Assamese script of the 12th-century Kanai-Boroxiboa inscriptions.

[14] S. N. Sarma has observed that the Assamese script pertaining to the period from the 6th century to the twelfth century can be termed as the ancient Kamrupi script.

[3] In late medieval period, three variations came to be used, Gargaya used around Gargaon, Bamonia, used by Brahmins in preparation of Sanskrit texts and Kaitheli used by the Kayasthas and called Lakhri in Kamrup.