Hey Matt.
The style of lettering on that R38 3sh is similar being the upside down U, but on the piece you pointed out initially, it looks like the lettering is against a black background (similar to the R51 material) but maybe it is a bat with wings pointed downward, rather than up? Or, maybe, as you suggested, the title section was created locally, by the theater itself, and put below the image.
I have to do research for work online, at various times, so I have found theses images online from multiple sources.
Jeff
And here's one other shot/angle of the same theater box office that got this part of the discussion going: