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[shion]

@Severest

They appear to be mechanical pencils with sliding sleeves rather than double knocks.

Correct, the Pilot is a sliding sleeve. Pilot literally named it “Young Pipeslide”. I posted information on this exact MP here:

Pilot Unknown Model

Hello, just to provide an update to this thread, I recently purchased this same mechanical pencil, and was able to find it’s model number. Thanks to the post here: Pilot 1977 Catalog (fp&mp) HMF-120SP HM-120SP-03 (-03 being the 0.3 variant) ヤング パイプスライド (Young Pipeslide) [HMF-120SP-03.PNG] パイプスライド式 シャープの決定版 0.5 0.3 ノック式 軸鞘: 銀色ヘアーライン ステンレス 調仕上げ、アルミ、ガイドパイプスライド式 使用ケース:B3 1,200円 Hope this post helps any one else who owns or looks to own this classic piece. [HMF-120SP-03_20241119_142…