That looks just like the ECU on my '84.  When I did a parts search, I found
it listed as an '84 Digijet ECU.  Ben also has one for sale here:
http://www.benplace.com/parts_sale1.htm.

It is very likely interchangeable with 025 906 021.

Additionally:

025 906 021 =  DH
025 906 021 A =  GW
025 906 021 B = Idle stabilization DH, GW
025 906 021 E = Automatic Digijet DJ
025 906 021 F = Digijet DJ

025 906 022 D = Digifant MV / SS

2009/4/13 Scott Daniel - Turbovans <scottdaniel@turbovans.com>

> 'normal'  1.9 waterboxer engines .......for US models, 1983 to 1985 use the
> common 025 906 021                ECU.
>
> someone is calling me wanting a 025 906 021 C     ( 'charlie' suffix ) ECU.
> which I'm guessing is for a non-US model ??
> anyone run into this ?
>
> and,..........additoinally...............the ECU the person is after is a
> Triumph-Adler brand, not a Bosch .......
> are TA & Bosch brand ECU's interchangable  ? .........I figure they are if
> the part number is the same - but any thoughts on that are appreciated.
>
> thanks,
> Scott
>

--
Chris S.
Disclaimer: "Death and serious injury may occur"