Rob:
Have a gander at this safety on this T&S and see if it is similar:
http://www.bobjonesguns.com/details2.asp?id=4492S . With the stepped watertable and pin configuration, this looks to be a Nimrod type which is a hybrid between a boxlock, sidelock & sideplate. I may try to find some info on the safety.
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These images are either from a GGCA article by Peter Ravn Lund(GGCA No. 34 at page 20), from his copyright site, from an article by F. Franzen or may be found in a text or catalogue describing Funk's ”Jubiläums-Drilling 1835 – 1935" as I can't remember.
Here is a T&S with a Funk safety. Funk patented the safety & in the early 1930s, or in 1930, Ernst Funk, F.W. Kessler's son-in-law, purchased T&S for his son Alfred or Alfred put up the funds and made the purchase. Also recall that Ernst Freidrich Schlegelmilch's wife was a Kessler, probably a sister to F.W. Kessler. Not only are the sourcing relationships complex and interconnected but also are the families and I guess the sourcing to be due to the family connections.
Kind Regards,
Raimey
rse