Why are there 2 numbers on the weights of bench Press Machine?

I recently used a bench press machine in an old gym. There were multiple weight plates and each has two numbers on it. I was wondering what each number represents. The number on the left was lower than the one on the right. How do I know how much I benched?
I recently used a bench press machine in an old gym. There were multiple weight plates and each has two numbers on it. I was wondering what each number represents. The number on the left was lower than the one on the right. How do I know how much I benched? (the higher number is not the LBS equivalent of the smaller number by the way)

It could be stone (6.35 Kg) to Kg

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