The authorship of this tune is not clear, with different editors attributing the tune to different composers (or not naming one at all). See the instances list above for the different attributions.
From William J. Reynolds, Companion to Baptist Hymnal (1976):
"Nettleton first appeared as a two-part…
Display Title: Song of ZechariahFirst Line: Blest be God, the Lord of IsraelTune Title: NETTLETONMeter: 18.104.22.168.D.Scripture: Luke 1:68-79Date: 2018Subject: Christ | advent of; Israel |Source: Vers. OPC/URCNA 2016