Probably the closest match is a cadmium bearing solder CD-35
or the cadmium free version. see the pdfs under silver alloys at:
The pdfs may take a long time to down load ,but they show a wide
range of alloys. They are not all easy to buy in the US in small
what you want is a high copper content silver alloy.. The 35 has a
wide mushy range which may be desirable or not. The 45 silver has a
narrower melting range and is more fluid but not very brass
I have some other US sites --
For cast sculpture we use Everdure silicon bronze and gas or tig
weld with the same filler material.
I haven't worked with the tin alloys.