Buddhist Texts from Japan. (Anecdota Oxoniensia, Aryan series), 1881. (now out of copy-right), online: www.archive.org ; and reproduced in 'Buddhist Mantras of Sanskrit Siddhaṃ': www.wisdombox.org [pdf]
The Sūtra starts at the beginning of the first page, and ends at the end of line one of the second page. I'll try to find the time to transcribe the whole thing, but in the mean time here is the mantra section which begins slightly to the right of halfway along the first line of the second page:
The Heart Sūtra is followed by the Uṣnīṣavijaya Dhāraṇī.
The last line is a syllabary. It begins with a flourish and then the word "siddhaṃ" then the Sanskrit alphabet in the usual order ending with "...llaṃ kṣa."