Mike - Your razor was made by Gustav Felix who was in business from 1850 to the present time according to the Goins' Encyclopedia. The Gloria trademark was registered in Solingen in 1896 and Felix was listed in the 1922 and 1925 directories of Solingen cutlers. Your razor was branded for and imported by Landsman who was a retailer. Because of the timeframe in which Felix operated it is very difficult to say when exactly your razor was produced. But, judging from the excessive honewear towards the toe of the blade, it has seen a lot of service in it's day. There are still a lot of shaves left in that steel, so have fun.

Regards - Walt