An instruction to an agent abroad restricting him to buy from a named manufacturer is known as

The instruction given to an agent abroad restricting him to buy from a specific or named manufacturer is known as a closed indent.

Let me explain it in a straightforward way:

1. **Indent:** This is a purchase order sent by a buyer to an agent or supplier to buy goods on their behalf. It contains details about the product, quantity, and specifications.

2. **Closed Indent:** This type of indent indicates that the buyer has decided to purchase products from a particular, specified manufacturer or supplier. The agent must comply with this restriction while procuring the goods. The buyer has already made a choice, and the agent is simply carrying out their instructions.

In contrast, an **open indent** allows the agent to choose the manufacturer or supplier from whom to buy the goods, as long as the buyer’s requirements are met. So, the key difference is the level of freedom or restriction given to the agent in selecting the supplier.