I didn't use Google, though I did do a web search for an FDH6027 Diode. It
only pointed me to some companies who supposedly sell outdated parts. I
checked my ECG index as well - to no avail.

Does "anyone" have any info on said part? If I am not wrong, it "seems" to
be a "switching" transistor.
This transistor is used in an older Marconi 2 way radio to drive/switch the
Audio Amp on - from the squelch circuit - once a signal is received.

Better yet, does anyone - especially in Canada know of a parts reference
which would equate many of those older part numbers to something new or
"american"?

Many of the parts in that radio do cross into parts yet available. But the
diode, I couldn't find. I can't imagine it being outdated.

Thanks