Hi there:
Not sure if this is what you are looking for, but; have you seen the headstone in Belvedere in St. John's that has a metal top. It is a combination of stone and metal throughout and is quite large.
This headstone is in the area of my grandparents grave which we just had "refreshed" and there is this one headstone in the area, which is quite impressive-- more like a monument.
It looks like the name is Duggan, but I can not find any matching reference on the Cemetery transcriptions on this NLGB site for that name. I think it should be listed in section 5 of Belvedere, according the cemetery diagram.
I checked progress on my grandparents grave this AM and took a few pictures of this headstone If you list your e mail here I could send them to you; as I am not sure how to attach pictures here.
Or you could send me an email:
pangel99@icloud.comRgeards
Pat