Identification of vintage sloping window piece I'm trying to identify the yellow one, the red 60598 ones are for reference.

 

This is definitely Lego, it is written in the hollow studs. It does not have a part number underneath, only an 01 and a separate 3. I can’t find it in any of the usual databases. 

The yellow I’m trying to identify is 1x4 at the base, 3 bricks tall, leans back by on row at the top but is slightly wider than 4 studs at the top approx 4.5 so the overall dimensions are 2 x 4.5 x 3.
Must be 


Fabuland Front Window Squared Small, Part x652 on peeron.com




(image source peeron.com)