Responsa for Shabbat 115:9
ולא תצא בהמה לא בחותם שבצוארה ולא בחותם שבכסותה ולא בזוג שבכסותה ולא בזוג שבצוארה זה וזה אין מקבלין טומאה
An animal may not go out with a seal around its neck nor with a seal on its covering, nor with the bell on its covering nor with the bell around its neck,<span class="x" onmousemove="('comment',' v. supra 54b for the reason. ');"><sup>9</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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