Firstly, the mintmark H is the Heaton mint, Birmingham Ltd. KN is the Kings Norton Metal Company, also in Birmingham. Value will depend on: 1) Denomination of coin 2) Date of coin 3) Condition of coin The coins will be pennies I imagine. If you can attach pictures of them we can assess the grade better, but you must first register. Using Photobucket to host will save the bandwidth of this forum. Edit: If you are already proficient at grading, the pictures won't be needed as we can quote a direct book value.