Hi Jerry
@Pedals Past
Thanks for the photos.
The inverted W for an M is always an interesting variant. The first time it was seen there were some doubts, but it is entirely correct.
You can see from the details I've collected below that it seems Columbia were using it exclusivly for a short while, there being four known survivors in a block like this.
Also, Westfield hadn't used W in serial numbers at all before this point, but War Resrictions brought in in early September 1942 meant that civilian bikes produced by Westfield had to be stamped W before the serial number.
The frames for the G519's are J10, or October 1942 made, so it seems like the new W stamp was ordered, arrived, and then used as an M. Perhaps they thought to do this from then on, and were told to revert to a proper M, because later G519 do use a proper M.
Then there is a batch of civilian bikes, correctly stamped with the W...
View attachment 2148334
I agree, tyres and pedals don't look correct. Speedo also unlikely, but it's your bike, go with what you're happy with.
Best Regards,
Adrian