Spotted these in two small lots offered by the same eBay
seller, so I laid in the weeds and sniped 'er down.
Rimless circle cancels are moderately scarce, rimless oval cancels considerably more so. I also like the use of the archaic term "PHARMACEUTIST" rather than druggist or pharmacist.
Note the different font size used on the lower left 4c Proprietary.
Interestingly enough, I already had an example of a similar cancel on a 2-cent Proprietary orange (R14c), but that one had a different street address from these.