That quote above was posted by yours truly.
That "V600" box is a new one on me, and I was unable to locate any worthwhile info thus far.
It seems that the Dunnville factory had a knack for doing things a bit differently at times, and this model 600 box may just be another example of this.
This box for their Model 157 pistol is another such example from the Dunnville factory, marked as "150-7". When I showed Dean the pics of this box, he had never heard of nor seen one prior to seeing my pics.
Both boxes could simply have been a miscommunication between the factory and the printer, and once they were printed, may as well just use them.