Am I right in assuming that this is the Pilot H-325? If yes, when was it available?
It has a sliding sleeve. I have it in black, dark blue and transparent, and if I remember correctly I have also seen it in green.
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Since it has a sliding sleeve, then yes, it is a H-325, aka ‘Pilot Super Pro’, circa 1977.
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Thank you! I like ‘Super Pro’ 
It is strange that Pilot used this type designation for different pencils.
Yeahhhh! @pearsonified ranted mightily over Pilot reusing numbers willy nilly.
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Wow! This is even more confusing than I thought.
No it is not, I have 3 and they look completely different. Maybe a Sharp?
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Hey @wingwiper welcome to the forum
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