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See more on page 34 Romania used the entire year stamped after the serial number.They were manufactured at the Cugir plant in Romania from the late 50's into the early 60's.This is not very likely and that's why we can only apply that method of dating to the Factory 26 marked guns. This is a more unique weapon in that according to the dating scheme of the factory 26 rifles this would be a 1975 era gun. These were made in Government plants in Suhl, Germany. Not sure on how to tell the year of these weapons as no definitive pattern has been observed.
If the above mentioned dating scheme of the factory 26 rifles were applied to these two SKS's they would be from the year 1957!! This model is called the 'Karabiner-S' or K-S for short. The model designation is Type 63 Carbine and were produced in state arsenals.
The only dates that have been verified were from 1957, 1958, 1959 & 1960. In the mid 50's Russia started marking the guns on the left side of the receiver with a small star designating the manufacture at the Tula arsenal. When was the no date stamped Tula receiver cover gun manufactured?
There are reports of Romanian SKS's without the year stamped on them. The Russian SKS's were in actual production from 1949 to 1956 when the rifle of choice was changed to the AK-47. These are generally considered by many to be the last run in 1956. It would seem logical that it would be either late 1955 or early 1956.
It is believed that the M21 marked Chinese guns followed the Star 1 guns into North Viet Nam.
These three North Vietnam guns have the same Arsenal marking signifying from left to right 1963 manufacture, 1964 manufactures and 1965 manufacture. They made a newer one that should not be confused with the early ones. We don't know of an accurate way of dating these other than using features.