triciab5581 - my suspicion is that they are metal reinforcements. After the building has been up for a couple hundred years sometimes settling occurs and cracks form and they put in reinforcements to help slow down the effects of shifting. I've seen the douple esses (the esses with the line through them) before on buildings for that reason. The numbers could be for that reason or for some other esoteric reason. I don't know I'm just making a guess.
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