Yes, Randy is correct.
The appearance as to finish does differ (see the stack of film holders in my earlier post) slightly.
The link items that the OP posted at e**y will not work.
The original "technika" 9x12 and 13x18 used the 20's and 30's method which was a system of a slightly raised velvet light seal - against a completely flush surface on the plate holder. The holder is held in place (usually!) by the small catch at the entry end.
This is a good working system and the only problem is the loose GG when making exposures.
Orphaned backs will turn up - hopefully at more reasonable prices than the one's found!
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