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50x70 is not normal. 10x70 or 15x70 is a more usual type.
The first number is the magnification - eg eg 50x means 50 times or 10x means 10 times magnification. The second number is the diameter of the big front lenses in mm so your lenses should be 70mm diameter. If they really are 50x they will be impossible to hold steady. Check again or post a couple of pictures showing any writing on them.
Joe
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