There has been a lot of speculation on who really Kachagupta was as his name is not listed in genealogical information available thru various inscriptions discovered - including the Allahabad Pillar Inscriptions.
It has been speculated that Kacha was actually the original name of Samudragupta and that Samudragupta took on the Biruda 'Samudra' after becoming king... however, numismatic evidence may negate this theory based on new coins discovered recently - upto now the Kacha coins showed the King as a young man, but additional gold coins have come to light which show the King's figure portrayed as a middle aged man (See Kacha - Gold coin - Shivlee Collection - Variety B). So one can conclude that IF Samudra's original name was Kacha and he used that initially in his reign, only coins showing him as a young man would have that biruda on the coins.
Another theory floated is that Ramagupta and Kachagupta are one and the same. While no gold coins of Ramagupta have come to light and only a few Ramagupta copper coins have been discovered, this theory will need to be further discussed.
Another major thread in the discussion about the identity of Kacha is that he was a brother of Samudragupta and the uncle to Chandragupta II. Upon Samudragupta's death, the brother - Kacha - briefly took reign, prior to the official succession of Chandragupta II.
In the past these theories have been presented based on the fact that there is no mention of Kacha's name in the Allahabad Pillar Inscription which lists the official history of the Gupta Empire and Kings. Also, another point made in these discussions was that while there were a lot of coins found with the name "Kacha" on them, none of these showed the 'official' seal of the Gupta Dynasty - the Garuda Standard.
The Class II, Variety B coin of Kacha Gupta shows a Garuda Standard. The style and fabric of the coin also very clearly shows that this coin was minted in Mint B - the Gupta Mint responsible for the best quality designs in Coins from the Gupta era.
