According to Unusual World Coins, 6th edition, the coin is listed as X# 8.2 likely privately produced in 1918 on British India KM# 492 (dates from 1877 to 1901). This would seem to call for a Tokens entry or an Exonumia entry for Nejd as a Fantasy issue. I lean toward the Tokens entry for an unofficial countermark. Congratulations on an unusual and valuable coin.
Hi, Chris,
I would add as a Token instead of Exonumia. For name, I would use Nejd countermarked coinage - 1 rupee
Type of coin: Token
Date ND (1918) Comment: Host dates 1877-1901
Otherwise I think your page looks good. Of course, it all depends on the referee. Cyrillius, Sulfur and AmerSalmeh have all been helpful to me in past. You may wish to contact one of them for assistance and comments. I have added very few items myself.