The upper top slide casting for the Raglan Little John lathe. It is not uncommon for this slide to snap in two across the front edge of the T-slot. Machined complete ready to fit - though you have to transfer the gib-strip adjustment screws and, once assembled, drill and tap the holes to secure the feed-screw end plate.
The same casting to fit the later Raglan "5-inch" lathe can be found here