[Leica] Proud owner of a new Leica IIIg

[Vick Ko <vick.ko@sympatico.ca>]

I am the proud owner of a beautiful new Leica IIIg - but not the owner of a
manual.

Can you help me with these questions:

1)  there are rectangular frame lines and four corner-markers in the left
view-window.
     Can you tell me what the frame sizes are?

2)  there's a black lightning arrow next to 1/60 - what shutter speed is
that?  1/50?

3)  there's a red lightning arrow next to 1/30-1 - same question - what is
that for?
     It seems to operate the same as if I set the shutter to 1/30-1

4)  I can't see filter threads on the lenses - a 5cm f3.5 Elmar and 3.5cm f3.5
Summaron.
     How am I supposed to attach UV filters?   ;-)

Thanks all.

Vick