The razor has arrived, earlier than expected all things considered.
It has cleaned up pretty well and is in pretty good condition. Except for one thing, the stops are pretty worn down. I don't know exactly how they started but they look very similar to the Gem Junior, a raised bump with a ridge at the back that the blade stops in. However a modern blade very easily rides over the stops, I tried a vintage blade with the thicker spine, slightly better but still no good so I tried a wedge and with more spring tension and steeper angle it will work. A bit disappointed given this should have been one of the first razors to take a flat blade, I guess they were just worn down with use, there's no lug to break off.
At least I can get a shave with it, it looks great and its a great old razor to have.