Hi Ian. Under the assumption that they are real chips, here is my opinion:

KGB chips are generally more desirable than the Chesterfield Club chips, but matching $100 denominations make a nice set. I would say an sale price for the pair would be around $50 to $75. Most of these chips were sold through "Premiere Props", so if you have a COA, it would help.

The imperfection will not add value to the chip.

If you have any other questions, feel free to email me.