Pictured below is another version of the  "Trident" but with a headstock arrangement for drive by countershaft or line shafting. The particular example shown was branded "Jardine" for a long-established Hong Kong trading company . Like the "Trident" the 38mm bore headstock spindle ran in adjustable tapered bronze bearings with a separate powershaft drive provided for the sliding and surfacing feeds that gave three rates of feed for every setting of the changewheels. If you recognise the manufacturer, or have a similar lathe, the writer would be interested to hear from you.