Need Help With Time Period Of US Cavalry Hat Badge 3/G?

[Travd3]

Any info. on this insignia would be a great help.  Time frame, unit info. etc. It looks like the pin was replaced at some time with a barrel pin (1910 era).  Partial marking starts PA but the rest is under solder where the barrel was attached. Measures approx. 2-1/2" x 1-1/4" 

[FlyNavy02]

Looks like a typical P1896 cap badge, Troop G, 8th US Cavalry Regiment, that has been made into a woman's brooch. I associate the drop in catch with insignia made beginning late in World War I and lasting well into the 1920s. Recall I have seen  "PAT'D" or perhaps "PAT." stamped on one. 

[CAC1901]

Its a standard enlistedmans 1896-1902 cap badge with the screw post removed and made into a pinback using a locking C catch. Unlikely for uniform or military purposes but for use on a coat breast. Usually for a wife/sweetheart, veterans association / events etc. The rotating lock c-catch, in the jewelry field, is associated with the 1920's to today. The t-bar style pin has been in use for a long time up to the present. The modification here looks like it could be anywhere from 1920's or afterwards according to my resident vintage jewelry expert. 

[Travd3]

Thank you both for the great info. It is very much appreciated 

[Cobra 6 Actual]

I believe that’s a Burgess Catch, patented in 1909: https://patents.google.com/patent/US927827A/en As CAC1901 noted usually you see these from the 1920’s on to now.