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The 51S comes with 2 pieces, foil and cutters; the 52S is one piece fully assembled. They are not interchangeable. When you see the "S" and "B" after the number, S stands for silver, B is for black.
Sorry, there was a problem. Please try again later.The 51s fits the older model 5 series. It is a 2 part replacement, the foil and the cutting block. It is a silver color. The 52s is a one part unit and is black in color. They are not interchangeable.
Sorry, there was a problem. Please try again later.The main difference between the two is that the 51s includes the cutter. the 52s only comes with the foil.
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