1955 Colt OMM grips on it EEE #13 ?

I bought an old Colt I frame OMM having nice target grips with grip angle changed to a 1911 type . Maker EEE # 13 stamped in them .
I say old bullseye grips for these Officers Model Match .38 revolvers .
Anyone help?
Thanks

Possible that these were on an Ellis Prop House gun at some point? Perhaps the EEE isn't related to the manufacturer? Although that would be odd, as these don't look like grips you'd expect to see in a movie. 

Dave

I like that angle, kinda reminds me of the Bisley grip angle. Very nice to shoot with.