What is the value of a 1954 elizabeth Regina south african coin?

It depends on the denomination and condition of the coin. "Elizabeth II Regina" means "Elizabeth the Second, Queen", and "South Africa Suid-Afrika" is simply the name of the country, first in English and then in Afrikaans. All coins issued in South Africa in 1957 had both phrases ("Elizabeth II Regina" and "South Africa Suid-Afrika") on them.