| CPC A63B 53/0475 (2013.01) [A63B 53/0408 (2020.08); A63B 2053/0479 (2013.01); A63B 2053/0491 (2013.01); A63B 60/54 (2015.10); A63B 2209/00 (2013.01)] | 20 Claims |

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8. A golf club head comprising:
a body portion comprising:
an interior cavity;
a front portion;
a toe portion having a toe portion edge;
a heel portion having a heel portion edge and a hosel portion;
a top portion having a top portion edge;
a sole portion having a sole portion edge;
a back portion having a back wall portion, the back wall portion comprising an external ledge portion having a first external ledge portion extending from the toe portion edge toward the heel portion edge, and a second external ledge portion extending from the heel portion edge toward the toe portion edge, a distance between the first external ledge portion and the sole portion edge increasing in a toe-to-heel direction, and a distance between the second external ledge portion and the sole portion edge increasing in a heel-to-toe direction;
a perimeter groove below the external ledge portion and comprising a first portion extending on the toe portion edge, a second portion extending on the sole portion edge, a third portion extending on the heel portion edge and a fourth portion extending on the back wall portion;
a removable mass portion coupled to the back wall portion, the removable mass portion comprising a material having a greater density than a density of a material of the body portion;
a face portion coupled to a front portion of the body portion to close the interior cavity, the face portion comprising:
a front surface configured to strike a golf ball;
a back surface opposite the front surface;
a perimeter portion having a first face portion thickness;
a face recess portion on the back surface having a face recess portion depth, a second face portion thickness defined by a difference between the first face portion thickness and the face recess portion depth; and
a back groove portion in the face recess portion having a back groove portion depth, a third face portion thickness defined by a difference between the second face portion thickness and the back groove portion depth; and
a filler material in the interior cavity coupled to the face recess portion and the back groove portion,
wherein the face portion is between the hosel portion and the back wall portion in a front-to-back direction;
wherein the first external ledge portion and the second external ledge portion join above the removable mass portion;
wherein the first face portion thickness is greater than or equal 0.025 inch (0.635 mm) and less than or equal to 0.125 inch (3.175 mm),
wherein the face recess portion depth is greater than or equal to 0.007 inch (0.183 mm) and less than or equal to 0.024 inch (0.610 mm), and
wherein the back groove portion depth is greater than or equal to 0.003 inch (0.076 mm) and less than or equal to 0.015 inch (0.381 mm).
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