ssh-pkcs11-helper(8) on macOS
The text bb977053943a, as macOS 11.5, macOS 11.4, macOS 11.3, macOS 11.2, macOS 11.1, macOS 11.0.1, macOS 10.15.6, macOS 10.15.5, macOS 10.15.4 shipped it.
ssh-agent helper program for PKCS#11 support
Flags it lists
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-v