Physically determine speaker wattage?

[J M Fahey]

I've also replaced a fair number of speakers with the same frame stamping as the MG series, though not branded MG. Identical construction in every other respect and branded Celestion. Maybe these are knock-offs. Or maybe Celestion has decided that putting their name on a cheap speaker does the brand a favour. Like Daewoo cars that are sold in the UK badged as Chevrolet.

Frame stamping and cutting dies are *expensive* so typically a manufacturer orders a set and uses them for decades.
So in general "each has his own" and in principle Celestion "should" use the same all over the place.

That said, they might very well use thinner gauge metal (typical is 16ga but they might use 18ga or even 20ga) in the cheapest speakers, since they use tiny magnets and maybe gaps are wider so no need for tight tolerance.

And given Chinese huge Market domination, some entrepreneur might have cloned the Celestion ones.
Expensive dies become cheap if you stamp a zillion parts.

I have both seen non Celestion speakers (such as WGS) with what looks like exact same frames and Celestion branded ones with "CELESTION" stamped in frame edge metal, what seems to confirm the existence of a second source.

Maybe somebody was buying $25 WGS speakers (in bulk) and labelling them "Celestion"