Mark on Mid Century Bookends

These are 8 inches tall, and marked with what looks like M Z and VI IV. I'm not sure of the material. I think pottery of some type or plaster/composite. Does anyone know this mark?
In searching I saw one other pair, identified as Ben Seibel, which I don't think is right.
Thanks!

 

Oops, sorry for the repeated photos, don't know how that happened.

 

You have time to edit your post. Photos can be deleted just like text.

 

I found these sold by EBTH. Their description says they are painted metal! They do not identify a maker.

https://www.ebth.com/items/10290756-sculptural-teardrop-painted-metal-bookends-mid-century

By the way, I'm not knowledgeable about marks but could swear I've seen that mark before. Maybe on this site somewhere?

 

Ah, this mark has been asked about before, by a different poster!

https://www.antiquers.com/threads/help-with-the-pottery-mark.30050/

 

Thank you Bronwen, edited.

Thank you Figtree. I don't think these are metal.

 

I didn't think so, either, but I don't have them in hand. The description in that auction could be inaccurate. You can see in the other discussion from here that I linked, the original poster said theirs were pottery. Anyway, I thought the link to EBTH could also show a potential value in case you are researching that.

 

Well, I hadn't thought of that! The Roman numerals, you mean...

 

I also thought it might be 1964, and the style would be reasonable for that date.

 

As INH noticed, not just the same mark, the same model bookends. They look like 1964.

 

I noticed, too, just didn't happen to mention it since the OP was asking about the mark and I was focused on that. oops!

 

I like em!

 

I want to bludgeon whoever meant that for a date. MCMLXIV is not that hard.