If there is one feature that immediately makes a LeBlond lathe recognisable it is the screwcutting gearbox with its "barrel" selector. The basic design was used from 1920 onwards across the entire range from 10" to 25". It was a very compact unit, using a barrel and quadrant lever on the larger lathes - and the barrel together with a horizontal lever and sliding "Norton" type gear on the later 10" Regal. By WW2 the lathes of  17" and above were fitted with a modified design with a top lever of more conventional appearance.