Unboxing: Apple's mid-2010 iMac has changes on the inside | AppleInsider
Used Apple iMac 21.5-inch 500GB Hard Drive 4GB RAM I3 Proessor (Mid 2010) - ZD Laptop Service Centre
Apple iMac 2010 review: Apple iMac 2010 - CNET
Apple iMac 27-inch (Core i5) Review | Digital Trends
Incase anyone ever needs the answer…I have a 27” 2010 iMac working in Target Display Mode with a M1 MacBook Pro using a miniDP to USB C adaptor that's capable of 4k60Hz.
iMac 21.5 Mid 2010 - CJD E-Cycling
Apple iMac A1311 21.5 inch Desktop - MC508LL/A (July, 2010) for sale online | eBay