An unused 'new old stock' brass drip feed lubricator or drop sight feed oiler.

Marked 'PAT 503444' on both filler caps, this patent was granted to the Kingfisher Lubricating Company in 1938 and relates to improvements to spring lids on oil cups, lubricators etc.

1¹/₄ inch glass reservoir sleeve with cork washers.

Four viewing windows on the sight chamber.

1/4 BSP thread.

In the original, tatty, corrugated card packaging.

Approximately 5 inches overall length.

Please see images.

We have another similar oiler, details can be found here.