Hi all - I'm wondering if anyone knows about small 6 oz green beer bottles without labels. I'm finding a bunch that have XFB over NCC embossed on the side at the heel of the bottles. Also finding "FE", "FD", "M", etc. They all have crown finishes and are machine made - but not clear if they are made in a fully- or semi-automatic machine. They were found in Vancouver, BC. Anyone know about those codes? Date is likely around 1915-1920.