No problem. The "squashed-O" marking is found on commercial magazines from 1933 to 1942. You will also find USGI pistols with these magazines that were transferred from commercial to military for WWII use. The transferred magazines had parkerized bottoms versus the full-blued commercial magazines. Here are some pics for your reference.Thank you. This helps. Looks like the lettering is not elongated like in earlier versions.
Thank you for the link.Post #21 in the thread shows the style you need.