I'm miles from the property so unable to look in any detail, but in the top right hand corner. To the untrained eye, and based on the only image I have, its shape is reminiscent of an RSJ.
To those who work with these materials’ day in, I’m hoping the mystery can be solved !
Ideas on a postcard please
To those who work with these materials’ day in, I’m hoping the mystery can be solved !
Ideas on a postcard please