This pdf shows all the Crane layouts. Saguaro's Crane should match. Remember, YMMV.
http://www.concertina.com/crane-duet/Wilton-Bulstrode-Crane-Tutor.pdf
Looks to be a Maccan, and if memory serves, the English Made crossed by Trade Mark makes it a Lachenal Maccan.
Someone will correct my error, be there any.
It is an inexpensive "concertina-like-object". The reeds are arranged like an accordion. They are placed on blocks as opposed to horizontally on the sound board. I have one like it and the biggest weakness is the way the buttons are attached to the levers. Better quality instruments have buttons with holes that the levers go through. Your concertina (and mine) have rubber tubing under the plastic buttons that the levers pass through. When the tubing dries out, problems occur.
But they are playable, learn how to play it!
I agree, mostly, with Clive Thorne. An Anglo is an Anglo because of its button layout. 20/30/40 buttons in that layout, with two notes per, defines Anglo.
The same applies to EC and the various Duets. It's the layout that determines the system.