For your information your oil dispenser was introduced in 1931 (there is no way to determine when it was actually made) and was still in production in 1959. The 607 had a 60-gallon tank and a shipping weight of 140 lbs.
The fact that it has a Standard Oil lid means that Standard ordered a large enough units that Bennett made a special Standard lid for them. This was not uncommon, the more you purchased the more we'll do.
Again for informational purposes, these lids are not interchangeable between manufacturers. Each company had different measurements for the hinge, where the lock went, etc.
If you would like to see pictures of your unit this is what on my website: http://petrolianacollectibles.com/bennett%20highboys.htm