I think it falls in the 2nd change of .32 Hand Ejector series 1906-09
that # would be 1908 roughly
However without alot more info such as all barrel stampings and locations of such also stamping on left or right side of frame.
Also I'm not to sure of the 5" barrel, the barrel on a revolver is measured from the end of the cylinder face to the end of the barrel.
Quote:
S&W Mod.64-5 ser.#BRL73xx
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The mod. 64-5 was production change that took place and run for aprox. 10 yrs. til 1998 when the 64-6 was introduced. without more information such as the star extractor or newer design changed 1994. Square butt was ended in 1995-96 and the MIM trigger 1997.
So with that info maybe you can help yourself with very aprox. date of Manufacture.
Have a Merry Christmas everyone!
-2sigs