"The Hardy Boys/Nancy Drew Mysteries" was an American television mystery series based on the Hardy Boys and Nancy Drew novels which ran on the ABC Television Network from 1977 to 1979. The "Hardy Boys" and "Nancy Drew" stories ran separately although sometimes characters from both series appeared together. The "Hardy Boys" series was based on the books written by Franklin W. Dixon The "Nancy Drew" series was based on the books written by Carolyn Keene Both sets of books were published by the Stratemeyer Syndicate.

The principal stars were:
Parker Stevenson as Frank Hardy
Shaun Cassidy as Joe Hardy
Pamela Sue Martin as Nancy Drew

The coins in these programs are imitation Spanish American eight reales coins or 20th century European coins.

The four episodes with coins here are:
"The Mystery of Pirate's Cove" which was first broadcast on February 6, 1977.
"Will the Real Santa Claus...?" which was first broadcast on December 18, 1977.
"Mystery of the Avalanche Express" which was first broadcast on February 26, 1978.
"Dangerous Waters" which was first broadcast on October 28, 1978.

The four episodes:

This is a Nancy Drew story only. Nancy and her friends explore an old lighthouse and find a pirate treasure chest. Nancy becomes suspicious and uncovers a modern money-laundering scheme involving rare coins.
Director: E.W. Swackhamer
Writers: Glen A. Larson, Mildred Wirt Benson

The chest is found in a cave under the lighthouse.
The coins appear to be prop coins or imitations of old Spanish coins.

The chest is now in a lawyer's office.
The coins are found to be too modern for pirate treasure.

This is a Nancy Drew story only. A man dressed as Santa Claus commits burglaries. A suspect is an elderly man but Nancy investigates to find the real burglar. Director: Michael Pataki
Writers: Michael Sloan

Santa lifts the coin board.

A board with some mounted European coins.

The upper left coins are imitation Spanish coins.
A British coin with Queen Elizabeth appears near the center.

This is a Hardy Boys story with Nancy joining them. The boys are on a train when a girl asks for help. She is being pursued by men. Nancy becomes involved. The girl has loose change in her purse which is shown. Director: Christian I. Nyby II
Writers: Michael Sloan, Susan Woollen

The coins are somewhat older European coins. An old Italian coin appears on the right.

Some more coins. A Mexican coin appears near the center.

Some of the above coins are handled including the Italian coin.

The Liberty Head or 'V' nickels were minted from 1883 to 1913.
This one turns out to be a rare example.

This is a Hardy Boys story only. The boys help a young woman who is searching for treasure.
Director: Richard Benedict
Writers: Lee Sheldon

The treasure chest has a few coins.