What you've got there sure looks like a "Shorty Nine", which is actually a Performance Center version of the standard model 6906 with a few extra garnishes and tricks. If I recall correctly ... even though it is the smaller frame 6906 style the PC number was something odd like the Performance Center Model #5906 Shorty Nine (while 5906 is the model number of the full size double stack SS 9mm). I always wondered if that was another S&W Model Number blunder or if it was corrected in later versions. The one I have is likely 1992-ish manufacture with the PC model 5906 designation.

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ANTIQUESMITHS
LM1300 SWHF425