I am anwering all these replies now because I have been gone for two weeks to Carlisle and Hershey.
I won't say never, but new pumps were usually not put on farms. Farmers were usually given pumps by the local jobber as long as they purchased their product from him.
The pumps that were put on farms were usually trade-ins from stations that were upgrading their pumps. Small town oil jobbers would go to the large cities and buy aa truck load of pumps to put on farms. This is why a pump with say, Shell logos on it could be found on a farm in an area that never had a Shell distributor.
I do have some original Milwaukee Pump Company invoices for their Model 33. This pump was developed in 1912 as a curb pump, but was still being made in the 1930s and being sold as a farm pump. The invoices were found in a jobbers warehouse in Wisconsin, and each one of them listed the farm that the pump was being order for. The pump was selling for around $35.00 in the 1930s.
There are no records of how many pumps were sold with or without ad glass.
Here is an opinion of mine. If you were a large oil company ordering pumps for all your stations in the northeast you would probably order them with ad glass cut outs. The pump company probably wouldn't charge you any additonal and the oil companies were looking for the most exposure they could get. If you were a small town station owner ordering a single pump to put out front of your garage you probably got one without ad glass panels bucause they cost a little less.


Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at www.gaspumpbible.com
Air Meter ID book also available