To determine the year of manufacture for a Belgium Browning 12 gauge shotgun with serial number 49198 6G, you would typically need to refer to Browning's serial number records. Generally, for Browning shotguns made in Belgium, the first two digits of the serial number indicate the year of production. In this case, the serial number suggests it was likely produced around the late 1950s to early 1960s, but for precise dating, consulting Browning's records or a detailed reference guide would be necessary.