Old Zincography Zinc Printers Plate Leacock Motor Oil From Portugal 14cm (5.5")

Description

FROM MADEIRA WITH LOVE
Vintage Zincography.
Old Zinc Printers Plate, recently found in storage, abandoned a generation ago by a Portuguese publisher.
This is a field I know nothing about, however, as a found object, it is very appealing.
The plate is an advertisement for motor oil, "Leacock" brand.
It has survived free of bends or distortions, however, expect to find some age related discolorations and spotting.
Measures 14cm (5 1/2") square.
I inserted a standard size playing card in one photo as a size referrence.
MUCH-OBLIGED