Backup plates?

I have several rectangular and square plates that I acquired recently from a letterpress shop. Some of these plates have poly plates attached. Poly plate and backer mic. out to about .890”. Are these similar to boxcar backers? They are quite old. Seem to be made of aluminum or maybe magnesium.

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If they were like the Boxcar bases they would add up to .918 with the plate attached. What is the thickness of just the base?

Daniel Morris
The Arm Letterpress
Brooklyn, NY

They are .890” without plates. Several have poly plates attached so I figured that the owners were just packing out to .918”.