sammler.com, a major German collectibles site, quotes retail prices at around €2 for a coin with slight wear, twice that for an uncirculated one. If the condition is less, it's only worth its face value at the time Germany switched to the euro in 2002 - about 25 cents (either US or EU)
The value of a 1961 50 Groschen coin can vary depending on its condition and rarity. In general, it may be worth around $1 to $5 USD for a circulated coin, but it could be higher for a coin in excellent condition or with unique features. It is recommended to have the coin appraised by a professional coin dealer or numismatist to get an accurate valuation.
Please check your coin again and post a new, separate question with its date and whether the "50" refers to groschen or schilling.
The value of a 1930 Oster Reich groschen coin can vary depending on its condition, rarity, and demand from collectors. Generally, these coins can be worth anywhere from a few dollars to around $50 or more. It's best to have the coin appraised by a professional to get an accurate value.
It's still worth 50 cents, the dates stamped into the coin adds nothing to the value.
50.00
There was no such coin in Britain. The 50 New Pence coin was introduced in 1969.
50 cents
I have one with a "50 Groschen", a flower going through the "0", on the obverse, and a shield on the reverse with the words "Republik Österreich" going around.
Such a coin does not exist. The British 50 Pence coin was first issued in 1969.
This coin is valued around $200.
50 centimes
Spend it.