An eBay win, this is a very special ESLA. Whilst the two-ways are the most common, 3-ways are rare by comparison, and 4-ways are extremely rare. They were produced for lighting crossroads, the four main beams being used to shine down each road segment.

Such specialised lighting was therefore only used sparingly; by the 1950s, Waldram was arguing the case for lighting T-junctions and cross-roads by the use of 2-way lanterns placed beyond the junction itself; the driver could then see junctions by the gap in the shadow of the kerb.

I've never seen a 4-way ESLA in-situ.

After taking this picture, I scraped the paint from the wings and revealed its angular schedule; perfectly symmetrical it was a 90° 90° 90° 90°.