The images may be upside down or rotated. Brighten them up and consider they could be Bhutan. Unless you have already ruled that out. I don't get a good match for Cooch Behar, but I get a better similarity in Bhutan, 1820-1835.
I don't think these have any silver in them. They are copying Cooch Behar, which IIRC was fine silver. Early Bhutan issues I have read are a silver-lead alloy, but the more common ones are just copper.
Comments in mt books say they did begin with silver. As time went by coins were melted and were made with increasingly debasing alloys until they ended up with copper / brass issues some with a silver wash. If at first the coin was presumed to be Cooch Behar, then it follows it would have been presumed to be and described as silver.
Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2026 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited. Contact Us | Advertise Here | Privacy Policy / Terms of Use