Scooterotica

I was trying to ID a gearbox I have with Stickies manual and I'm not sure what I've got.

Gears:
50/42/39/35 - SX/GP150

Cluster:
9/12/16/19 - LI125 S1/S2 Early S3 Italian & Spanish.

Well I know what I've got but what benefit would this give being a mixed gear box?

If you have correctly counted then that is what you have, loose gears from a GPSX 150 and cluster from an Li125 Series 1/2/3. Most likely wouldn't mesh properly but others on here may know more.......................