London Transport introduced Setright Speed ticket machines to Green Line Coach services commencing in 1953, which, at that time, were crew operated. With the introduction of one-person-operation to single-deck country bus routes machines rendered surplus because of reductions in Green Line services were redeployed on these operations because the previously used Ultimate machines did not have the fare range for the longer routes.
 
When London Country took over the operation of the Country Bus & Coach department in January 1970 all the remaining Green Line routes, with the exception of the 709, were converted to one-person-operation using Almex 'A' machines. The Setrights were then issued to the remaining Conductors for use on bus work which enabled the Gibson machines to be returned to LT.
 
With the introduction of decimal currency in February 1971 the Setrights were crudely converted by the removal of the shillings bar and the insertion of a screw in the pence dial to prevent it from moving past 9½ pence. The letters s & d on the 6 and 9 digits were never removed. An interesting feature of LT Setrights was that 10 to 19 on the shillings wheel printed sideways, presumably in an effort to deter potential fare evaders from altering their tickets to a higher value.
 
In our picture we see three LT Setrights, no's S151, S168 & S192. All three machines have been converted back to £sd by the insertion of a 'shillings' bar and the removal of the screw in the pence dial.
THE PICTURE BELOW FROM THE NET

MINE

....ADVERTISEMENT IN A 1954 MAGAZINE...