I have a bunch. All of them have the caliber scratched or hand engraved (e.g. 30/06, 38spl) into their sides at the top. The words "Hollywood Gunshop" are also machine-stamped above the scratching. One is chrome-plated and has everything machine-stamped.
Dunbar shellholders look the same, but I don't own any of them, so I can't comment on their exact description. The same goes for a Herter's clone of the Dunbar.
The scratching is very faint and hard to read. Are you saying your shellholders have a one or two-digit number stamped into them like other manufacturers do?
If so, I'd like to see a picture of it.
Member: Orange Gunsite Family, NRA--Life, Varmint Hunters' Assn., ARTCA, American Legion, & South Cuyahoga Sportsmen's Assn.
Caveat Emptor: Cavery Grips from Clayton, NC. He is a ripoff