It should be 4.12.x, the oldest version I had in the lab was 4.12.8.1 and the sha512 is there:
HOST1...11:20:46(config-mgmt-defaults)#sh ver | grep image
Software image version: 4.12.8.1
HOST1...11:22:10(config-mgmt-defaults)#sh active
management defaults
secret hash sha512
HOST1...11:22:28(config)#sh run sec user
username test secret sha512 $6$TKE1E8lKUQKBfKdF$bGTlFTnhtPj3N5s.4VXCgN3hXoNu1SQR48tiAI8yXMkyTpwopeUSMpN6VsegYsOKaZKWMGiJSz7LWpCTRIIs71
Please note that this version has been end of support for more than 5 years, currently supported EOS versions are 4.19 or newer.
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