Don't forget that Type 1 NM rifles were selected from new production so the serial number of those 800 NM rifles built in 1953 would be in the 4 mil range. The serial number of your rifle would help in determining it's history. Looks to have been built or rebuilt in 1962 based on that year code. Someone else will have to explain the 1952 barrel. I would have thought maybe a 1960 build based on the barrel but no 1960 year code ??