Yes a picture of the bottom would help, maybe lol........
I do see some detail on the victorian block in my book, & some pieces in the same pattern are plain,,,, go figure.
Also, as I read up, apparently Imperial got ahold of the Victorian molds, and made some pieces in crystal also. However Victorian pieces should be marked the with H inside a diamond.
So my best guess is either you do have Duncan block, which I don't have a listing of all the pieces they made, or you have a piece of Victorian made by Imperial, after they removed the Heisey mark. Good luck identifying those, you need a crystal ball.