It states 1920 Hopper cooled Model in the title (as additional text) and
1920 Petrol Paraffin in the text. Whilst I will admit it is not specifically saying that is the year of manufacture, it is infering it was made in 1920. I would dought that the showplate is rivetted to the crank guard, all the ones I have seen on 4 and 5/6HP were cast as part of the lower crank guard.
Havng had a 1923 4HP model myself for the last 32 years I have compared enough of them to find there are many small design changes over the years.
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.