When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Up for sale is a highly collectible, complete vintage Hewlett-Packard HP-21 electronic scientific calculator set from 1975.
This is a beautiful piece of computing history, preserved as a single owner (whose neat vintage label markings are present on the box, manual, and charger).### 📦 WHAT IS INCLUDED:
* **HP-21 Calculator:** Classic 1975 model with legendary RPN (Reverse Polish Notation) logic. Back label reads "Made in USA". Inside the battery bay, a handwritten vintage date reads "11/8/75".
* **Original Outer Box:** Displays the iconic blue HP-21 logo styling of the mid-70s.
* **HP-21 Owner's Handbook:** The original spiral-bound manual, dated June 1975 (Rev. C 6/75), featuring the historic Cupertino, CA address on the back.
* **Original Leather Zipper Case:** Genuine HP-branded textured brown protective pouch with a smooth zipper.
* **Original AC Adapter / Charger:** HP Model 82024A (Made in Singapore) with the built-in mechanical 115V / 230V international voltage switch.### 🔍 CONDITION DETAILS:
* **Cosmetic Condition:** The calculator, keys, case, and manual are in fantastic aesthetic condition for being over 50 years old. Please see high-resolution photos for exact cosmetic details.
* **Battery Compartment:** The internal terminals inside the battery bay are remarkably clean with no signs of old battery acid leaks or crusty corrosion.
* **Operational Status:**
**UNTESTED / AS-IS**. The original rechargeable nickel-cadmium battery pack is not present. Because early HP "Woodstock" series calculators require a functional battery pack inline to regulate voltage, I have deliberately NOT plugged the AC adapter directly into the bare unit to protect the delicate internal LED chips from blowing out. This is a premier addition for any serious vintage electronics, calculator, or HP collector. ### 🚚 SHIPPING & HANDLING:
Will be packaged with extreme care in a sturdy box with ample bubble wrap to ensure the original 1975 retail box is completely protected during transit. Ships quickly with tracking numbers provided. Please feel free to reach out with any questions prior to offerding. Thank you!
