You are correct the design patent is 1935. Its always best to post the supporting reference, link or image (so I dont have to do it).It looks like the patent design is 1935. Should be no earlier than 1935 to a good number of years later. Someone with more knowledge about bottles than me should chime in. There is a bottles forum on the treasurenet site. Post it there or ask a mod. to move it.
https://www.google.com/patents/USD9...YBQ&ved=0CDUQ6AEwAA#v=onepage&q=95464&f=falseShould be but maybe not. Does the glass division of Armstrong Cork use the same date number system as Owens-Illinois Glass? Again its best to post supporting reference, link or diagram, If you have a bottle dating code for Armstrong Cork Co, please post it, because I dont have it and I cant find it.49 should = 1949