there was some connection between "Trojan" and Lambretta Concessionaires (Agg owned both?) but I've never heard of any Trojan "logos" appearing on Lambretta scooters.
Regards the "175/ 200 Factory conversions" mentioned above, likewise I've never heard that coming out of the factory in Milan.....however, I do recall TV175's being converted to approx 200cc's by official Lambretta dealers in Bristol- I would imagine this was a simple rebore and suitable piston, but the cylinder walls would be prone to warping etc. Perhaps, and it is a big perhaps, these "conversions" were well known to The Concessionaires and eventually had some impact on Agg asking for proper 200cc machines?? Who knows?
That's cool and I am happy to stand corrected. It's not often something new actually comes up. Maybe a chemical strip would be better than sanding? That stamping is already pretty lite.