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British date codes

Quick question about date codes.
From what I understand the British-made Gillettes didn't follow the US date codes. So how do they work? I didn't see anything in the wiki unless I missed it.
I picked up a British tech that I know is from the early 70's but it also has S P stamped on the base plate on either side of the handle. Is it possible to narrow it down to the year and quarter?
Thanks fellas.
 
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