This query is unclear. To answer effectively, I need more context. "Which 762 x 53" could refer to several things, including:
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Dimensions: Are you asking about an object with dimensions 762 units by 53 units? If so, what are the units (mm, cm, inches, etc.)? What kind of object is it (a piece of wood, a photograph, a screen, etc.)? More information is needed to provide a meaningful answer.
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A calculation: Are you asking for the product of 762 and 53? This is a simple multiplication problem. The answer is 40,406.
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A product code or model number: Is "762 x 53" part of a product code or model number? Without knowing the manufacturer or product category, I cannot provide any information.
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Something else entirely: The phrase might have a meaning specific to a certain field or context that I am unaware of.
Please clarify your question with additional details so I can provide a helpful response.