Re: Old calculators.
HP33C here - bought for me by my father from a company called "Sumlock Bondain" in Birmingham for me to take with me when I went to Uni.
[I believe Sumlock Bondain were associated with the 1960s ANITA calculators]
The HP33C still works - sort-of. It's got the dreaded poor-contact-between-the-chips-and-the-PCB issue so you sometimes have to squeeze it a bit to get all the digits to light. Also the little angled PCB-with-springy-contacts-riveted-on-it that serves as one wnd of the battery-compartment has suffered from battery-corrosion, one of the springy contacts became brittle and snapped off during a battery-change. It's botched with a soldered-on bit of the phosphor-bronze=wool stuff used as a RFI-proofing gasket.
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