India 2 Annas 1877 - Plugged Or Countermarked ?

I think drilled and plugged, probably by an Indian jeweler.

I often see small American small silver of the 19th Century that has been holed, most probably for jewelry purposes.

sel_69l,
Your reply interests me, as I too have bits of jewellery incorporating 19th century US silver

for example, an 1875 20c in VF20 with a small hole fortunately missing most of the design,
an 1856 dime in EF with a hole to the left of the date.

Can I sell them as they are ?
If so what percentage of the numismatic value should I expect to get (say on ebay) ?

Should I attempt to restore these coins ?

Pertinax:
Unfortunately, they are impossible to restore, with the type of damage they have sustained.
As they are, they are worth only a small fraction of what they would have, without damage, for a coin in otherwise similar condition.

As a parallel example, may years ago, I bought a Roman gold Aureus of Claudius, with the 'IMPER.RECEPT' Praetorian Camp reverse in about VF condition, from Spink's in London. The coin had a grievous test cut through Claudius' head, and I was able to purchase the coin for 1/10th of the cost, relative to the equivalent undamaged coin. ( not much above gold value)
I wrote to Spink's, asking if it could be repaired. The answer was that it would most probably be worse than if I did NOT to repair it. I took that advice.
I sold it to a coin dealer buddy of mine for his personal collection, about 30 years ago, for only a few more dollars than what I paid for it. He still has it
An otherwise magnificent coin.