R14 & R18 On New York Photograph -Not A Cdv

Found this in a shop across the river from the USMC in Cold Spring. First non-CDV with revenues I've had. By Lord, 164 Chatham (Ralph A Lord seems to have only operated from 1864 to maybe 1867 when George Howard Johnson and/or H H Boyles (of Ellissons) are both listed as having taken over). Lord may have been gone by some time in 1866 even.

This is basically printed on thin cardstock and has the layout of an oversized CDV but is 6 7/8 by 10 inches.

Wanted to ask if anything more can be said about R14 and R18 or if I finally got something correct?

Gentlemen both appear to be wearing 9 button Infantry Officers jackets but I don't have much else to go on after that. RnC

R14c and R18c is correct. Nice oversized photo. I have a number of them. They usually have more tax affixed than regular-sized CDVs, as the cost was higher.

Nice military subject matter too.