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.