Thanks - the verticals of Scotch Modern are a good match, though the serif at the top is quite different, and the loop around the middle points up in SM, but down in Southward's. One that is a closer match would be ideal, if possible.

Still looking to identify the font, preferably a version of the per sign with more narrowly-spaced verticals as in John Southward's 1892 Practical Printing.

The sign over number 9 is the one I was most interested in - the per sign.

“The 1892 edition of the Practical Printing of John Southward showed a series of non-alphabetic characters in its example of an ‘improved’ upper case which had not been in a normal case earlier in the century. […] types for the calligraphic ‘per’ and for lb (the pound weight). These were all needed for use in commercial jobs like the printing of catalogues of goods for sale. […] The ‘per’ symbol (which was admittedly a rather elaborate design) failed to get onto the normal typewriter keyboard and has faded from memory."
http://typefoundry.blogspot.com/2013_10_01_archive.html

⅌ per sign U+214C

Any font with a similar per sign might do: one where the verticals are close to each other and the serif at the top left points down, not up.