The only thing I can say is that according to Brophy what you got is what it is, going into the book further on the other hand the Glenfield Model 25 is the same thing as the Marlin Model 780 except it came with a Birch stock and an old style trigger guard. Going a bit further the Model 780 came from the Model 80C, which in MHO strongly resemble the Model 25, now the 80C was apparently produced from 1941 through 1971 with NO production during 1942-1944. Maybe what you have is the 80C? It's a bit far fetched but is it possible? Mr fixit