Responsa for Shabbat 115:15
אמר מר ולא בזוג שבצוארו אבל יוצא הוא בזוג שבכסותו
are. But if you say that we learnt of clay [seals], [it might be asked] are only these not susceptible to defilement, whereas their utensils<span class="x" onmousemove="('comment',' Of clay. ');"><sup>15</sup></span>
Teshuvot Maharam
Q. May a person attach a metal buckle to his girdle as an ornament, and then file the buckle into the shape of a key with which he can unlock the door of his house, and then wear this buckle on the Sabbath?
A. People do not usually wear metal keys on their girdles as ornaments. Therefore, this key is not considered an ornament and he is not permitted to wear it on the Sabbath.
SOURCES: Pr. 532; Mord. Shabb. 350; Hag. Maim. to Shabbat, 19, 4. Cf. Maharil, Responsa 84.
A. People do not usually wear metal keys on their girdles as ornaments. Therefore, this key is not considered an ornament and he is not permitted to wear it on the Sabbath.
SOURCES: Pr. 532; Mord. Shabb. 350; Hag. Maim. to Shabbat, 19, 4. Cf. Maharil, Responsa 84.
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