Spain.
It should have the country's name on it. Most likely you'll see Espana, which is Spain (in Spanish)
Ptas is the abbreviation for pesetas. This is the currency that Spain used before converting over to the euro.
Yes.
yes it does have a 25th coin!
at least 200 dollars on e bay but at least 1000 to a collector
The 100 ptas coin is a Spanish coin. The British Halfcrown coin has a face value of Two Shillings and Sixpence. To get a valuation on either coin, you would need to provide the date and condition of the coin.
All PTAS coins from 1868-1982 actually have the two dates. The larger one is the date the coin was authorized and the one in the star is the actual date of the coin. Most PTAS sell for around $2.
max 10$
Spain ESPAÑA The 1957 date on the front is only the design date. On the back in a small star (on left) is the mintage year, from 58 to 75 and sometimes it gets worn away and is unreadable.
A 1957 50 ptas coin with a star and a 59 marking is not considered rare and typically has no additional value beyond its face worth. In general, a 50 ptas coin from 1957 would be worth a few cents in US currency.
A 5 PTAS coin is short for 5 pesetas, which is what Spain used prior to the Euro. The exact value depends on the date and variety, but for the majority of dates, they're only worth a couple of cents in circulated and a couple of bucks or so in uncirculated condition.