Baby horseshoe crab specimen vintage

Beautiful baby horseshoe crab and coral encased in, preserved and suspended inside a biological transparent gel and a glass dome. The gel is an innovative process patented by John N. Brown, Iminac, Inc., Arlington, Texas in the early 1970s. Super interesting and fascinating for classroom display, or on teacher's desk. Unique paperweight to give, and keep. 4" tall, by 2" diameter.