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I believe this is a hammerless Parker DH Grade 3, with a Titanic Steel barrel, manufactured in 1925. I don't know what the T with the circle, the HT A in the triangle pattern, the 4 superscript 4, the J.G. in the circle, or the 12, 2, or 3 markings mean. Picture of all the important parts are below.
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The gun is a Quality DHE, which is also known as a Grade 3.
The T in the circle is the barrel steel type marking -- Titanic
The 3 near the rear of the right barrel flat is the grade as is the 3 under the serial number on the watertable.
The J.G. in the oval is the mark of James Geary contractor/foreman of the barrel making department.
The 4 superscript 4 is the weight of the unfinished barrel set.
No one is really sure about the HTA, but speculation is High Tensile Alloy or Heat Treated Annealed.
The 2 on the barrel lug is the frame size -- the number of sixteenths over one inch of the center-to-center firing pin spacing. In this case 1
2/16 inch or 1 1/8 inch. If the other marks on the bottom of the barrel lug are 12 (I can't make them out in the picture) that is the gauge of the gun.