very odd music notation

• May 4, 2022 - 19:54

Hi all,
Has anybody ever seen the two notations highlighted in the attached picture?
What's their meaning?

Attachment Size
Capture.JPG 53.99 KB


Hints for tonic sol-fa? This would fit with F as do, A as mi (oft. abbrev. m) and B natural as fe. It's missing a key signature, mind you.

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