Hi Chad, The gun has 'made in usa' which came about around 1923.
I have one that is 3866xx that letters as Nov.12,1923.
It has the rebated backstrap & uses the Regulation Police type grip.
The older Bekeart extended targets will fit it though, as they cover the backstrap.
Be carefull with those grips (reg.police) as they are real fragile on the front of lower frame. Some guns have a nice radius while others have a more square front corner. Be carefull trying the grips on other guns.
As to value...I have seen them from $300 to $1200....depending on condition,grips,boxes,"Bekeartness" (older ones)
Compared to the post-WW2 pre-35 & 35's, these can be had for less, and to me, have more 'character'.