Keys on HP-67

[Didier Lachieze]

Well, there is no doubt that the legends on the top of the keys are double-shot molded. But the question is for the legend on the angled side. For all the old HP calculators where these legends are not black but blue (HP-65, HP-21, HP-25/C, HP-29C, HP-32, HP-33E/C, HP-38E/C, HP-41C, HP-11C/12C/15C/16C) they are printed/painted/silkscreened, not molded. So I doubt it's different on the 67.
One way to know for sure for the HP-67 could be to drill some holes….