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Here is the little brother to the above DX's.  These were known as the Shimano SX...  This particular pair was purchased new by me around 1988 or 89.

Want to know the date of your Shimano DX pedals?

There is a sequence of numbers on the side of the original boxes e.g. 1-4690021000.

I could find nothing on it's meaning so I figure it is more or less a barcode of some type.

This is where your date code is located on your DX pedals. This stamp is GJ.

Note, I have not been able to find a similar stamp on the PD-MX15 pedals.

This is a Shimano date chart.

So, the pedals above were manufactured October, 1982

This is Shozaburo Shimano - He started Shimano back in 1921

May '1983 Red 9/16

1st batch Japanese made 2nd gen Shimano DX

Shimano PD-MX15 9/16" NOS with original reflectors.
OG Box and believe the plastic bags are too.

Shimano PDMX-15 Pedal 1/2"        Blue set is dated 1983(according to chart above).     White set is dated 1986.   
Even though same pedal model you can see the style difference.