16th year of production (1971) Barrel Lug: Short
Battle Sight on RSL: 3
Bayonet Type: Spike
Bayonet Lug: Late Non-Cut
Bolt Carrier: Late Non-Cut
Gas Tube: Late 2 Piece
Gas Block: Early Milled
Receiver Cover Takedown: Normal
Rear Sight Block: Mid Milled
Serial Number Format: 7 digit, 1,6XX,XXX
S/N on Components: Last 5 digits
S/N on Stock: Last 5 digits, leading zeros, large font (0.315")
Stock Swivel: Side
Trigger Group Type: Late Stamped
Notes: Found right here on SKS-Files, user Phosphorus32! Won at a Sullivan Auctioneers (Hamilton, IL) auction held on February 12, 2016. Bayonet not original to rifle, but correct type. The reddish-brown semi-opaque paint appears original based on the appearance of the stock SN and small cartouches. (click on images for full size).
Barrel Lug: Uncertain
Battle Sight on RSL: Uncertain
Bayonet Type: gone
Bayonet Lug: late
Bolt Carrier: Early Cut
Gas Tube: Uncertain
Gas Block: Uncertain
Receiver Cover Takedown: Normal
Rear Sight Block: Uncertain
Serial Number Format: X Digits, 180434x
S/N on Components: Last 5 digits
S/N on Stock:
Stock Swivel: Bottom
Trigger Group Type:/Late Stamped