Mfg: likely Rae
Place: Hamilton or Orillia
"Master" Vise Models

I've run out of leads researching this brand so time to post what I have and hope members can provide additional clues.
My first sighting of this brand was a single poor picture of a mechanics style vise in a 2021 auction in Kelowna, BC. Notable only because it has the curved buttress at the front of the static jaw which is a design unique to Rae and Clark Machine.
Repainted and repaired Master vise - no model number or specs.
December 2023 a similar vise was auctioned in Prince Albert, Saskatchewan. The model number was visible. I bid, won, and eventually got my hands on it. Same jaw width as a Rae 30, but smaller opening and markedly lighter.
D-30
Master D-30 right and left sides, and a Rae 30 for comparison.
Jaw width: 3" (measurement. Same as Rae 30)
Jaw opening: 2-1/4" (measurement. Rae 30 spec is 2-3/4")
Weight: 6.6 lb (measurement. Rae 30 spec is 9 lb)
Also in December 2023 a "Master" utility vise showed up on Kijiji in Winnipeg, Manitoba. Model WD-4. No specs, but looks very like a Rae W-4, which has a distinctive profile curve on the dynamic jaw.
WD-4
Master WD-4 right and left sides, and a Rae W-4 for comparison. No specs available.
Made by Rae, but for what company?
I'm fairly confident these vises were made by Rae. The curved buttress doesn't seem to have been used by anyone else except Clark Machine, which was a smaller producer and doesn't seem to have done any OEM work, unlike Rae. The Master WD-4 and Rae W-4 look very similar, and the model numbers almost match.
The lighter weight and cheaper construction (compare the handles and nose pieces, for example) would fit with "Master" being a house brand for another company. I
posted a close-up of the logo after seeing the WD-4 but no-one had any leads. Montgomery Ward used the Master brand but never operated in Canada; the locations of the three vises I've seen so far (Manitoba, Saskatchewan, and BC) suggest a Western Canadian business.
Any westerners recall the brand?
If you have a Master vise I would greatly appreciate pics and specs. Thanks!