The 1885 $5 Liberty Head gold coin, known as a half eagle, can have significant value depending on its condition and whether it is circulated or uncirculated. To determine if your coin is uncirculated, examine the high points for signs of wear. Uncirculated coins should have no visible wear, with original mint luster intact.

Values can vary widely:

Circulated coins: Generally worth around $500 to $800, depending on condition.
Uncirculated coins: These can range from $1,000 to several thousand dollars based on their grade (using the Sheldon Scale, ranging from MS60 to MS70).
If you’re uncertain, it’s best to consult a professional coin grader to get an accurate evaluation and potential certification, which can help in establishing its true value.

Your 1994D penny might indeed have an error! Those extra bumps you see on the reverse above the 'O' in 'OF' and between the 'ME' could be die chips, a common minting error that happens when parts of the die break and leave raised marks on the coin. Die chips often increase a coin's value slightly, especially if they’re prominent. Enlarging the picture can help verify this. Let us know if you need help with further identification!

Attached please find photos of the coin in question. It's my hope this will improve the prospects of arriving at a value for this coin.

Thank you for your reply. I look forward to hearing back from you should these pictures be of any assistance with determining this coin's value.

Sincerely,

R. Cruz