Bitsavers - IBM "Component Description" manuals.
Model 1: http://www.bitsavers.org/pdf/ibm/2250/GA27-2701-3_2250mod1Descr.pdf
Model 2: http://www.bitsavers.org/pdf/ibm/2250/A27-2702-0_2250mod2Descr.pdf
Model 3: http://www.bitsavers.org/pdf/ibm/2250/A27_2721-0_2250mod3Descr.pdf
Model 4: http://www.bitsavers.org/pdf/ibm/2250/A27-2723-0_2250mod4Descr.pdf
IBM promotional video “Frontiers in Computer Graphics” from the 1960s.
Total run time about 20 minutes.
There is a general lack of online 2250 material.
If anyone has anything they could make available it would be useful.