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its not a specific date, but from what i have seen on LCN closers , the year, week of that year and the shift closer was made in is all stamped on the PACKING NUT
for instance if you see 1 03, this closer was made in first week of January in the year 2003
the number by itself identifies the shift if its a 1, that was the morning shift at LCN closers, a 2, that was PM shift. the 4 numbers together, those are the closer model number (4040 for example) these numbers are there for warentee purposes, LCN (1000 and 4000 series) are 10 year warentee)
if no numbers on the packing nut, check the long end of closer (tube part, called the spring tube) in the 1970's and 80's the month and year and model number was stamped there.
packing nut= the not around closer shaft that the arm connects to.
hope this helps, I'm an expert in door closers
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