Gridley Half-Pint Dating Help

[Csa]

Thank you so much. I wondered about the 29. But it's never so simple. Haha! Glad it is.

And yeah... triangle with an S. I'll keep looking for that aspect. Thank you for the info and link!

The SHA link I sent has a great deal of info. The small S could be the plant code. I have dug many with E for Elmira NY inside the suction scar. Thatcher bought up a lot bottle plants as they grew, so lots of diff plant codes, and “sealed” numbers over the years. The 2 on the heel is the sealed number I believe.
here is a passage from the SHA article. Shows the large bottle sort marks, like your triangle I think. Also showing two pix of mTc milks I dug, a D 1926 and 3E3 inside the suction scar from 1933

 

[Kevin S.]

Wow. A lot of variance. I'll get into that link more deeply. Thank you!

 

[K6TIM]

The 1800's milk bottles the seam went only to the bottom of the lip.The lips in those cases were either applied or tooled lips applied meaning they had to apply the lip by hand.Tooled lips they used a lip forming tool to make the lips.The former lips are older.They called milk lips cap seat lips!