Curved Belleville 259 ceramic heater radiant insert 7" long 4 1/2" deep

Description

This is a curved ceramic radiant, or insert but I have not been able to determine what stove it fits.  It says Belleville 259 on the side.  It measures 7" long and 4 1/4" across.  1 of these had been out of the package a long time and is kind of dirty, with markings...so it will be the last one shipped out.
This item came from the liquidation of a hardware store, and is new old stock.  They may have markings from the store, or have a slightly dirty look...it was an old store.
Please ask if you need more information, and thanks for looking.
Most of my items are pre-owned, usually from estate sales, so I try to describe them accurately and show flaws in the pictures.  Any props in the picture, such as easels, ruler, or backdrops are not included.
Please contact me if you have any issues with your purchase and I will do my best to resolve it.
Thank you for looking!