I have a full box of Peters brand .38 Special 200 grain loads. The end flap is marked 38 Special 200 Grain Lead Index 3841. The box has the "Warning Keep Out of Reach of Children" marking so I guess it's post-1962. It is brass cased, headstamp is R-P over 38 SPL with a lead round nose bullet and they are in a styrofoam tray. It would be difficult to know that it was not a standard 158 gr LRN if the package was not marked.