I recently bought an early 1950s vintage Official Police in 38 Special.
It has what I think are the correct style wood service grips with silver medallions.
On removing them, I found either "600" or "009"(depending on how read) written on the back of both grips in what looks to be grease pencil.
The serial number of the gun contains neither of these number sequences. I'm wondering if this means that these grips are off another gun, or if the markings I see on the back have another meaning.