I never heard of Silver Bell, but it could have been a house brand. I
don't know if Emerson had manufacturing capability at this time, or if
they were still buying chassis from International in Ann Arbor. If
the latter, International could have made their own version, with a
cabinet from a local supplier. All things considered, this seems the
most likely explanation. I don't think Ben Abrams would have cut the
ties to International before being sure he could go it alone. The
Compact model was a runaway success, as it turned out. I think the
"portable" features were dropped after Abrams saw how few customers
cared.

Alan