Very tidy, pity about the side cover.
My machine serial number is 27125, the information I have shows model 50 production year as 1934. However the serial number of mine falls in a range that is shown as allocated to model 52, 1937 to 1940, (26401-29296). Confusing.
Looking at the Wico magneto information i have it looks as if the JAP engine should have a 1057BZ, the BJ engine is fitted with a 966BZ. The Gem series IV had an 1137BZ. A CJ1385 was fitted to Clifford and Landmaster fitted with JAP 600cc engine. What the output characteristics of these is i don’t know.
That number does not seem to relate to anything in the list I have, my 50 is serial number 27125. Is 19019 on the big plate on engine cowl or is it on a small brass tag on fan housing (engine number).
The best place to find the exhibitors name would be a copy of the show programme. The club does not run the horticultural section and not all exhibitors are VHGMC members.
You may be lucky if one of the other forum members attended and knows who the owner is.
The Museum of English Rural Life (MERL) at Reading have a collection of Mayfield information and factory records. It may well be worth contacting them to see if they have what you want.
robbob123, original topic title is causing confusion I think, so I have started a new topic for you.
To answer your question your Monro Tiller is a Minor with 2 stroke Villers 7F engine.