Produced by M.M. Buck and later Handlan (?), widely used on locomotives and tenders by the D&RG and other American roads around the turn of the century.
Pair(2), G-sockets cast into brackets with 1/16" rod for mounting. Lenses not included but available here:
https://www.shapeways.com/product/D48EMVE62/handlan-4-way-lenses-sprued-1-20?optionId=199206366&li=shops