Hall was a supplier for Ford before the war and there are HALL LAMP marked grill BO light doors. I think HALL LAMP made them for VEP GPWs and then removed their marking and put the script "F" on later versions. I have not noticed GUIDE buckets/doors on VEP or mid production GPWs.
GPW 17963 4/24/42 Chester, PA. USA 20113232 (est.)
GPW 85976 12/9/42 Louisville, KY. USA unknown
GPW 108552 4/21/43 Louisville, KY. USA 20371278
Bantam T3 4582 10/29/42 USA 0173499 (est.)