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Hard to say but this doesn't look like an M10 245 to me.

Need to see the markings I mentioned.

Shown it to a friend who said it is a 5 speed

Could be a 5 speed. But it is not a 245.

Could be a 240.

240 M10 5 speed overdrive ("late" models):

240/5.30-ME (part number 23001220421)
240/5.31-MF (part number 23001220423)

Recognised by:
- 2 piece aluminium case
- Mechanical speedo output
- Shift pattern: as 4 speed, 5th top right
- Markings should include "240" (follow by more numbers), six unidentified numbers, and the letters "ME", or "MF".
- smaller than the getrag 245, not much bigger than a getrag 242 4 speed.
- three bolt output flange 23211224091
- somewhat longer, requires shorter drive shaft part number 26111225470

Giorgo any other pics of this?

If it's a 240, the linkage mounting on the top leads me to think it may be a 240 from an E30. In that case, look out for the mechanical speedometer input. Also, it may be tricky to get the linkage all set up correctly.

If it is from E30 it still does fit on the M10 right?
Except for the speedo, I think? Are there any solutions on this?

Unfortunately i don't have any more photos. All i care is to be 5speed and to fit on my m10 engine. I asked the merchant to take more photos and sent me but he told me that he already had the gearbox shipped away.

Did the last E21 models have different speedo like the E30 perhaps? So it might fit? does anyone know?

No electronic speedos on E21s, but some early E30s had mechanical output on boxes.

Good luck

Let's keep our fingers crossed then
Giorgo we are waiting for update here

I hope that i am not naive for believing the merchant without having seen the gearbox live but only in a photo. :/

Fingers crossed indeed

I received the gearbox. Should i post the photos here or start a new thread?

I suggest you post them here, it is still a technical matter