Oops sorry for any confusion gents,
first, it was col rex applegate, not fairbairn.
second the image is not mine but a limited commercial repro of the origianl applegate rig.
The image is the "Applegate", built by Karla Van Horne of Purdy Gear,
a recreation of the Detective Wonder Holster originally produced by SD Myres of El Paso,TX circa 1930.
here's an article
https://americanhandgunner.com/editors-picks/purdy-gear-rigs/applegate actually used a breaktop, and according to the article was instrumental
in getting S&W to bring out the 5 shot Chiefs... here is a photo of applegates rig
here is another brief advert:
I have seen two versions, both made by Purdy Gear one the upside down, which may be dicey for retention,
and a right-side up which looks like a high rise paddle rig
that one is what I am thinking of..... sort of a paddle - armpit holster instead of a shoulder rig with straps.
yhs
prof marvel