I had a look in some old catalogues and these might help...
From the 1931 catalogue.
And from the 1936 catalogue; it's the same in the 1938 catalogue. The price then was 6/= (six shillings or UKP 0-30).
Trying to be exact about small or cheap Leitz parts from before the war is always difficult. The printing blocks were used after the models had changed and, although I've seen their "General Catalogue" for 1929, 31, 33, 36 and 38 the 1938 one is called edition four but I make that edition five.
It's easy to get your hands on these old catalogues, they often appear at various prices from nearly130 UK pounds for the 1929 one to pennies. Hove Foto Books also reprinted them and these vary in price as well. In general terms the reprints have "Catalogue for 1936" and so on on the cover. Dealers often confuse the two...
Looking in the 1960 code conversion index the ABLON is shown as No 14126E but has disappeared by the 1966 catalogue.
You'll also see trimmers made by R G Lewis, a famous dealer in London.