When we fed the coin eating machine at our bank with the heavy content of our savings bottle, it rejected a fews coins. Amongst this was a British Penny, “ONE PENNY” from 1990.
The rear side shows a crown with underneath a grid.
I looked for it in Wikipedia:
“The original reverse of the coin, designed by Christopher Ironside, and used from 1971 to 2008, is a crowned portcullis (Fallgatter) with chains (an adaptation of the Badge of Henry VII which is now the Badge of the Palace of Westminster), with the numeral 1 written below the portcullis, and either NEW PENNY (1971–1981) or ONE PENNY (1982–2008) above the portcullis.
Value about € 0,25