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Damn it! You've got me reading interesting stuff now:-
"The earliest production HP-35 units had a small hole to the right of the on/off switch. When the HP-35 was turned on, a red spot showed through this hole. This was soon removed - you could see the HP-35 was on anyway, because the display lit up! Even if the batteries were low, you could see the switch was at the side marked ON."
"I believe only about 10,000 of these "HP-35 with a hole" were made - but owners knew they had a collector's item, so they are nearly all still in existence. Ones in reasonable condition sell for at least $250 in the US - about £200 in the UK. One with its original plastic carrying box, leather case, AC charger, manual and stick-on "PROPERTY OF" labels can sell for $350 or more."
My first calculator was the size of half a house brick, took several AA batteries, had the green tube type display and would do +, -, * and / AND %!! Luxury! early 70s.
I remember the engineers spittin' chips. They paid big bucks for their HP35s, then the HP45s came in well under that price.
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