I have seen a few specimens like the one you have posted.
The mottled anterior combined with the black posterior certainly suggests an integrate between melanurus and erebennus or couperi, but the facial coloration has me inclined to lean more towards erebennus influence.
Unfortunately, even a scale count wouldn't be able to confirm an exact ID in such a case.
In any regard, it's a very nice looking snake and should make a great pet, though I would certainly avoid breeding such...

Best regards,

Jeff

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