I tend to agree with you about the reason for the lack of an inner guard, but do not consider myself knowledgeable enough about such things myself to make any useful speculation. The photos and his mention of this typological group are what drew my interest to the article.
I would be very interested in seeing the other 7 of the group, whether or not they have the eyeglass-shaped feature.
Unfortunately # 26.145.43 is the only one of the group on display as far as I can determine, and I have received no response to inquiries about the others, so for the time being the other 7 remain a mystery and I have only found the single photo of 26.145.40.
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