If you are referring to single row pickers, yes, there's a pic on page 76 of &quot;Oliver&quot; a photografhic history by April Halberstadt.   Remember the Oliver line derives from the old Nichols and Shepard company. You will find pic;s in Crestlines &quot;OLIVER  HART PARR&quot; by C.H. Wendel. (see pages 106 143 and 144) for pickers. Also in the same book on page134 you will see early and late pic's of the model 18 combine. Notice the different spouts on the unloading auger. Other less obvious changes are cylinder bearings, counter balance springs,  lift linkage for the header control, and unloading auger control accessible from the tractor seat on late models. There will be other 'running' changes as well, hope this helps.