Hi there..
The Calendar in the Indian princely states coils is Wrong .for example
https://en.numista.com/catalogue/pieces13987.html It is given Calendar Nepal - Vikram SamvatThis is Wrong, Vikram Samvat is not a Nepali calender, as Hinduism was main religion in Nepal they follow Vikram Samvat. The ancient hindu calender is used in Indian subcontinent,still now the festivals mainly hindu are celebrated with accordance with Vikram Samvat .
for example in north india -Baisakhi festival is celebrated with the date in Vikram Samvat
in east india (West bengal)-Durga Puja is celebrated with date in Vikram Samvat
in west india (Maharastra)-Ganesh Chuthurti is celebrated with date in Vikram Samvat
Vikram Samvat is a ancient Indian Calendar common in Indian Sub continent -India,Nepal,Bangladesh,Manyamar,Thailand,Cambodia,Srilanka,bhutan etc as the ancient culture in all these country is identical.
This should be corrected
Thanks
Arvin11