Pre Model 10 Hammer

I have a pre Model 10 (M&P) 2" SB #S95719 that has a hammer similar to pre-war M&Ps.
Is this the correct hammer for this revolver?
There is something missing in that serial number - not enough digits. If it is S95719x, then it is from about November 1947. So, yes, it would have the long action. The High Speed hammer wasn't introduced into the M&P line until S990184 (that one shipped in April 1948).
 
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