I identified three pumps made by S-S in my Gas Pump Bible identification book, that came out recently. Two are very similar visible pumps and the other is a twin clock face pump. My information said they were all available in 1930.

Jack Sim

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