This is one awesome looking razor. The handle is stunning and instantly recognisable. These go back to the 1930's.
This is the "Standard Model". It's a Two Piece, Stainless Steel razor with markings under the head indicating adjustability. The shape of this is unique to the adjustable model. There is an arrow (only a half arrow on this one!) on the underside of the bottom-plate and graduation lines on the top of the handle. Lastly the blade locating pins face downward.

Typical Darwin, the thread goes right through the TopCap and protrudes slightly but doesn't affect the shave in any way. These were the lower priced models but today they are a little more difficult to source then a number of the more expensive "Cobalt" versions.

On Adjustability - In the 1930's the blades were thicker and had more spring in them. It can no longer be called an adjustable using todays standard DE blades.

How does it shave?
Its a very mild shaver, so its not one that gets a lot of use. I do need to use it with new or newish blades.