Grease gun

Another old tool found in an old barn.
In Dutch this is called a "vetspuit". Did not know the translation and the machine translation indicates Grease gun. Personally, I would say it is a fat injector.
This tool was used by my father 25 years ago for the last time. The fat still looks good.
Originally, this came in the 60s of the last century in the coal mine. And then it was written off. So some history of over 60 years old.