Plus, the year is usually written on the first picture (right side of the middle part) for those coins.
The engraver seems to have run out of space here : we can clearly see "1" followed by what seems to be a "8" attached to a slightly "7"... but I'm not sure where the last digit is supposed to pop up after that
Anyway, that seems to be another point in favor of Ram Singh II with the combination 1874 / 39.
Edit :
I was writting my message when you add this auction.
- The first coin use the same die, indeed, but for me the attribution to Madho Singh II was wrong : he didn't rule in the 1870s.
The year should have been "1908" (or at least "198x" instead of "187x") for Madho with this regnal year. So this coin was minted during the rule of Ram Singh II.
- The second coin shows a latter type with the date the date 189[2] and the regnal year 13 of Madho Singh II this time.