British India Silver one rupee

I have an 1878 one rupee silver coin of British India with Queen Victoria on Obverse. I believe there is no mint mark and the reverse appears to be type IV.
can someone help identify this coin as I believe type IV coins are rare for 1878.

I cannot see a mint mark (dot) either. The reverse looks to be a Type II, closed top flower, slanted top of 1. The flower to the left of the date has 5 petals (shown below) and not 3 for the Type IV.

Thank you but I still could not find Bust A type/ Reverse type II/ no dot in the catalogue. No dot means Calcutta mint. Do we hv this coin in some other catalogue. Thx in advance

Have one more same type which I am totally unable to identify. Was thinking maybe fake although it's nonmagnetic

https://en.numista.com/catalogue/pieces3719.html

I agree. 1878 no mint mark, Type A Bust, Type II Reverse does not exist in the Numista catalog. It's also not in the NGC catalog (which means it's probably not in SCWC). So you either have a coin that doesn't exist or we're both missing something. Hopefully another member with more knowledge of these coins will reply.

Thank you at least you cleared my concept of type 2 and 4. Thank you.

The more I look at them, the less I am convinced they are genuine. Perhaps lets start with weight, diameter and composition.

Hi. The second one I also have doubt but the first one I just found a link.

I will post all the other details as soon as I can collect them. Although both are supposed to be silver and I checked they are non magnetic with the sound of silver when tossed

Citeer: "Piush"​Hi. The second one I also have doubt but the first one I just found a link.

​This looks like it has a dot mint mark.

Citeer: "harryg"​The more I look at them, the less I am convinced they are genuine. Perhaps lets start with weight, diameter and composition.

​hi the first coin is 11.41 GM's and the second is 11.49 GM's.
the diameter of both is between 30.5 and 31 mm