I thought it to be a brace of SSs overstruck w/ a tail diagonally which notes tube effort by Str. Schilling. I have serious reservations that Scherrell contributed any effort less accepting the funds from the client as the adornment/embellishment( Altdeutscher Laubgravur / Wetzlaub) if I have my terms correct) was by a Z-M mechanic.

http://doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=422081#Post422081

http://www.engravingglossary.com/Hand%20Engraving%20Glossary%20A.htm

http://www.graveurin.de/waffengravuren/

Kind Regards,

Raimey
rse