काशिका वृत्ति (आचार्य वामन एवं जयादित्य - अष्टाध्यायी सूत्र-वृत्ति सम्पूर्ण सान्वय सटीक)

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YES! In many 19th/early 20th century fonts, the avagraha ऽ was cast on a sort with a shirorekha!
Look at the curve: it is definitely an 'S'-shaped avagraha: ऽ!
It curves right, then left, then right, with a small tail. That is 100% an avagraha ऽ!
And grammatically, it connects to किमो from the previous line:
Line 23: ...किमो
Line 24: ऽदिति च प्रत्यन्तरं न विधीयते साकच्कार्थम् ॥
किमो + अदिति = किमोऽदिति!
This makes 100% perfect grammatical sense!

• Let's check line 23:
  क्व । गमिष्यसि ।
  Wait, look at क्व:
  There is a big black blotch. Is it क्व?
  Yes, क्व with a heavy ink blotch on the क.
  Then । गमिष्यसि । क्व भोक्ष्यते ।

• Let's check line 31:
  असौ ॥ औत्वप्रतिषेधः साकच्काद्वा वक्तव्यः सादुत्वं च ॥ * ॥ यदा चौत्व-
  Wait, is that an asterisk * between dand