To Stane Street Halt no more...

The conical finial and arms suggest that this is a product of Maldon Iron Works.  However, the spacer between the upper and the lower arms is not standard.  The post is not standard pattern so maybe original parts were used on a later date post.

Thanks to Nick Catford for allowing use of this photo taken from his Disused Stations website.  Visit the site for plenty of "then and now" as well as nostalgic images of disused or now forgotten railway stations.