Having looked at many examples, I think Victorian signwriters and foundry-men took inspiration from print fonts rather than copy them exactly, because their work is inconsistent.
As Gary shows, it's often possible to get close by finding a similar modern font, perhaps pinching letters from a few of them for best effect.
Possible to get even closer by converting individual glyphs into paths and editing the path for an exact match. Tedious rather than difficult. My preferred tool is Inkscape.
First find a donor font, ideally one that doesn't need much modification, Gary's Bodoni MT Black is good, but I don't have it on my system. My example is UFW Bookman, Semi-bold, Demi-face, which is similar.
Start inkscape and type base glyph, here the letter J, and change the font. At this stage the letter can be resized and stretched using the arrow handles.

Next convert the J object into a path with Path->Object to Path. The result can be edited with the 'Edit Path by Nodes' tool, found upper left.

The path describing J is defined by the square and diamond rectangles; more can added, and they can all be moved to change the path's route. Here I just pulled the round serif to show the 'J' can changed into any shape required.

These path defined objects aren't typed, but they can be copied, moved, resized to form signage. The ability to shape the same letters slightly differently, and to set them a little randomly also helps recreate the hand-made look of original castings.
Dave
Edited By SillyOldDuffer on 28/03/2021 17:04:08