That |R| is indeed strange...
Revival 565 from Bitstream is somewhat close, though not an exact match:
https://www.myfonts.com/fonts/bitstream/revival-565/

Dutch Mediaeval by Hans van Maanen [CanadaType, 2007] is a better match for |R| but the rest letters are off...

I’m not finding a match. If the sign was hand-painted, you may be dealing with a variation of Engravers:

http://www.myfonts.com/fonts/bitstream/engravers-oldstyle-205/
http://www.myfonts.com/fonts/ortizlopez/ol-engravers-classic/

Another typeface that comes close, though not for the |R|:
http://www.myfonts.com/fonts/berthold/concorde-bq/

I found similar |R|s in these typefaces:
http://www.myfonts.com/fonts/canadatype/dutch-mediaeval/
http://www.myfonts.com/fonts/canadatype/zilvertype-pro/
http://www.myfonts.com/fonts/redrooster/erasmus-rr/

It's a large, brass cast sign (3-feet by 9-feet?). The letters are raised, with the background dark. I converted the image to grayscale, upped the contrast, then inverted it to make the letters easier to read. I'm thinking it's not a standard print typeface, but something the sign makers had in their repertoire.

Revival 565 looks pretty darn close (though not quite). But I can still call that one a winner with a bit of modification!

Thanks!

Bitstream fonts were reissues of other foundries’ typefaces under new names; the original is Berling:
https://www.myfonts.com/fonts/linotype/berling/