Thanks for showing this version of the molds used for the dentist plaster type plaques.
I really like USN unit plaques. They make great displays, but, do take up a lot of space and are a challenge to store more than a dozen of them.
I met a navy veteran, Larry Vail, whose job was to make plaques for a couple of ships he served on. He had over a thousand plaques stored away back in 2014 when he and I corresponded. I've got photos of a couple hundred from his plaque collection.
Here's a few from my collection.