505 507 Hi-polymer leads 0.5mm B
Year: 1983
Description
Hi-polymer leads 0.5mm B
For tracing paper and vellum.
Available in 2B, B, HB, F, H, 2h, 3H, 4H hardness and size 0.3, 0.5, 0.7mm
And for film HB, H, 5H
Same design was used until early 90s when label was changed.
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