Ajax 1 & 2
In conversation with a fellow member I was asked the differences between Mk1 & Mk 2 Ajax's, 1933 to 1946, not exactly sure when the change from Mk1 to 2 was but I believe possibly 1936.
On quick inspection they look very similar, however a closer look reveals the following differences Mk 1 first & Mk 2 in brackets.
Smooth rear roller (Ribbed)
Front single wooden roller with screw in shafts (4 separate wooden rollers sliding on shaft)
Cutting cylinder 3 supporting webs/spiders (4)
Wooden Handles threaded direct to flange (Flange & fixing modified)
Holes for oiling (Nipples)
Cylinder adj single bolt (Lock nut added)
The Mark 3 of course introduced the alloy sides & during production the move from straight to cross-over handles.
I will leave another to compare the 3 with 4 & 5 as none in stock at present to compare.
Also the scraper plate had the relevant details depicting mk under and beside the AJAX name
hopefully my picture Will illustrate the above Clive mentions. I haven't a mk 2 to photograph.