Ive read that Mills bombs were made in France during WW1. Last time I checked there were none identified as such. Here is a No.5 with 2 large letters cast into it. In the photo is a VB and an F1 that have similar sized letters cast into them. The Foug citron can be found with large sized letters similar to these cast into them as well. If you have seen alot of cast iron/steel French grenades you have probably noticed these same types of large letters(as well as others). The WW1 Mills typicly come with small letters cast into them (if marked at all). The plug on this Mills is marked with the I J or J I logo which, last time I checked, was still unattributed. So, is it possible this is a French manufactured Mills?