Well spotted!
I hadn’t noticed, but the box with the V1 marking is of fairly recent Kynamco production.
I am sure that David Little, who founded Kynamco after he left Eley-Kynoch, was fully conversant with Latin numbers.
Whoever did the typing (they used self adhesive labels I believe they printed on the premises) probably thought it was V1 for Version 1 instead of VI for 6.
I have mentioned before that I knew an old boy who as a teenage gunner in a Home Guard Anti-Aircraft Battery in 1944 shot down a V1.
The doodlebug plummeted to earth to land just in front of their gun-pit. They made it into the shelter in time, but when they emerged found that the force of the blast had bent the barrel of their 3.7” gun.