[ArmedBear]

I have never seen one of these, or a picture of how it was worn.

Can anyone describe it? Is the gun carried on the right (strong) side, or is it a crossdraw?

[GRIZ22]

It's carried crossdraw like a regular shoulder holster.

http://www.pacificcanvasandleather.com/holsters/pcl_12_sh.htm

Here are photos. Not a bad copy. An original in good condition goes for several hundred dollars.

[dfariswheel]

The Victory model shoulder holster is a revolver version of the M3 "Tanker" shoulder holster.

Its designed to ride on your lower-right chest, not under the arm like a standard shoulder holster.
You put your arm through the shoulder strap and drape it over your head.
The holster rides low on your chest.

Here's a picture of how it is worn:

http://images.google.com/imgres?imgurl=http://www.bobtuley.com/should1.jpg&imgrefurl=http://www.bobtuley.com/shoulder_holster.htm&usg=__q-fOYoWvfm65FZ8rrE_hZjtpwyk=&h=240&w=175&sz=7&hl=en&start=14&itbs=1&tbnid=t-PkFKjz66ERpM:&tbnh=110&tbnw=80&prev=/images%3Fq%3Dm3%2Bshoulder%2Bholster%26hl%3Den%26safe%3Doff%26gbv%3D2%26tbs%3Disch:1