Rosettes and Revelations Pt.1: The Holy City - Koen Gheuens and Cary Rapaport

[CaryR]

About the tripartite hosts, I found some more of them:
   
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I was directed to all of these examples from this You are not allowed to view links. Register or Login to view. which goes into further detail about tripartite hosts (112). I didn't know that the tripartite markings on the host can be a reference to its "triple fraction" (the custom of breaking the host wafer into three parts)

"The elevated wafer can sometimes show a tripartite division anticipating its actual tripartite fraction..."

"The triple fraction symbolized Christ's threefold body ever since Amalarius of Metz first put forth the idea in the ninth century. According to the tradition as formulated by Peter Lombard among others: 'The part that is offered and put in the chalice represents the body of Christ which has already risen'...'the part that is eaten represents him still walking on earth'...'the part that remains on the altar until the end of mass signifies the body lying in the tomb, because until the end of the age the bodies of the saints will be in tombs'.