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
Any help would be appreciated. Thank you