I think that hand-set belongs to the asymmetrical version and not the symmetrical version (as is the OP version) but it's also doubtful that UG productions at the time were completely consistent
I admit to not being particularly focussed on the brand or model, but I believe that your final point is crucial. I tend to rely on Occam's Razor in these hazy areas, and given that the hands are completely consistent with the dial in terms of condition, I think that they likely left the factory together.
2 options then: either the hand-set has been changed during the watch life or due to crappy inventory management at that time the watch went out the factory in this configuration
If only watches could talk... 😵💫
I couldn't find the symmetric case version with these hands, but I could find the asymmetric case with hand variations. In my opinion, this could mean that both the asymmetric and symmetric versions used several versions of the hands.
As described we have the silver/orange, white and silver "baton" hands.
source http://www.polerouter.de/frameset-shop.htm
2 options then: either the hand-set has been changed during the watch life or due to crappy inventory management at that time the watch went out the factory in this configuration
If only watches could talk... 😵💫