Apple - iMac (21.5-inch, Mid 2011) i5, 8GB, 256GBSSD, High Sierra- Ref – Ordinateur St Joseph
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Apple iMac A1312 2010 i7-870 2.93GHz 1TB HDD 4GB RAM 27" - High Sierra | eBay
Apple iMac 21.5-inch Mid-2011 2.5GHz Intel Core i5 (MC309LL/A) – UNICOM, Inc.
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Apple iMac (A1312) 27 Inch High Sierra Intel 2.7Ghz i5 1TB HDD 16GB RAM Mid 2011 | eBay
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Identify your iMac model - Apple Support
How to Install macOS High Sierra - iFixit Repair Guide
Apple updates iMac and MacBook lines, launches MacOS High Sierra: Digital Photography Review
