In case you're having trouble with your research:

The
Delhi Sultanate - it's sometimes spelled "Dehli" because that's how the city is spelled in Arabic - ruled much of northern India and Pakistan between 1200 and 1550 AD.
Sikander Shah Lodi was the last great Sultan of the Lodi dynasty; a coin just like yours is depicted on the Wikipedia page about him.
"GG# D706" is the catalogue reference number for this coin, taken from "The Coins of the Indian Sultanates" by S. Goron and J.P. .Goenka.
"Billon" is a word that means "low grade silver, of very low fineness". The Dehli Sultanate was unusual in striking coins of very fine silver and coins of very debased silver at the same time, as well as coins of gold and copper. For this particular sultan, his billon coins are far more common than the other metals.
The "tanka" was the denomination, linked to the weight of the coin. At the time, a tanka was supposed to weigh about 9.4 grams, or 80
rati, but during this reign the weight of tanka often slipped to as low as 8.5 grams.
As for the date: rotate the top pic 90 degrees anticlockwise, so it looks like the
one on Wikipedia. The date-numerals are the three characters that look like "91E" at the bottom. These are Indo-Arabic-Persian numerals for "914", the date in the Islamic calendar, which roughly corresponds to 1508 AD.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis