I have this set of lego gears. I remember seeing them first at my grandparents in the mid 80's. They predate my firsts Technic sets (~84 or 85).
I have fond memories of my dad building a 3-speed gearbox with those.
The gears have a kind of spring (although some springs are missing) that snaps in the small dent at the end of the white axles. Also the gears have an odd number of teeth (9, 15 and 21) so you only have 1 chance out of 4 to align them correctly. Axles are compatibles with (black) technic axles, and he gears can be attached to technic, even if the teeth sizes are not compatible.
I found some references to similar (in shape and color) samsonite branded gears, but they're not alike. Also, it looks like samsonite gears where sold in the US only, so it's very unlikely for such a set to be found at my grandparents in Europe.
My question is: from which set(s) are those cogs coming from ? When were they produced. Are they pre-technic, or produced in parallel ?