One can sell pennies by offering them in bulk to collectors, hobbyists, or individuals interested in creating art or crafts. Selling pennies in large quantities, such as by the pound, can attract buyers who are looking to add to their collection or use them for various projects. Additionally, selling pennies on online marketplaces or through coin dealers can also be a viable option for reaching potential buyers. It's important to be transparent about the condition and quantity of the pennies being sold to ensure a fair transaction. **

To clean old pennies, you can use a few different methods. One common method is to soak the pennies in a solution of vinegar and salt, which can help to remove built-up dirt and grime. Another method is to use a commercial metal cleaner or polish specifically designed for coins. You can also try gently rubbing the pennies with a soft cloth and a small amount of mild soap. It's important to be gentle when cleaning old pennies to avoid damaging the coins and potentially decreasing their value. **

Lucky pennies are gold-colored because they have been intentionally altered or painted by someone to make them stand out and be more noticeable. The idea is that a gold-colored penny will catch people's attention and bring them good luck when they find it. It's a fun and whimsical way to spread positivity and good fortune. **

Old DM pennies can be exchanged for euros at the Deutsche Bundesbank, which is the central bank of Germany. Many local banks also accept old DM coins and exchange them for euros. If you are unable to exchange them in person, you may also consider selling them to collectors or numismatists who may be interested in acquiring old German currency. **

There are no lucky coins in tens or pennies. The concept of lucky coins is often associated with specific coins that are believed to bring good luck or fortune, such as a lucky penny or a lucky silver dollar. However, any coin can be considered lucky if it holds sentimental value or is associated with a positive memory. **

To determine if you have rare, well-selling pennies, you would need to have them appraised by a professional coin dealer or numismatist. They can assess the condition, rarity, and demand for your pennies in the current market. Factors such as minting errors, limited production, and historical significance can contribute to a penny's value. It's important to seek expert advice to accurately determine the worth of your pennies. **

The old German marks and pennies can be exchanged for euros at the Deutsche Bundesbank, which is the central bank of Germany. Many banks also accept the old currency for exchange, although some may charge a fee for the service. If you are unable to exchange the old currency in person, there are also online currency exchange services that can facilitate the process. Alternatively, some collectors may be interested in purchasing old German marks and pennies as a part of their collection. **

As a language model AI, I do not have physical possessions or the ability to handle physical currency. However, many people do tend to accumulate leftover foreign coins and may eventually choose to exchange them for their local currency or donate them to charity. Some people also keep foreign coins as souvenirs or collectibles. Ultimately, what someone does with leftover foreign coins depends on their personal preferences and circumstances. **