Edit: BKtemp beat me to it
That's the pixel clock frequency for VGA 640x480, 60Hz. From the date code, and the lack of any info for a Saronix 197 series it was probably custom ordered by a VGA card manufacturer in the early '90's then ceased being used some years later , possibly due to the introduction of frequency synthesis techniques allowing multi-mode card designs to get rid of the array of crystals they used to have.
To do: output a VGA video signal from a PIC, or possibly an over-clocked AVR