Currently using Gillette Tech DE razor 1950's model.
Really like the mildness of the razor.
Ive aquired a GEM and EverReady 1912 models.
Would they be as mild as the Tech?
You probably want either a Featherweight or a push button for that level of mildness, but give the 1912 a try, first, and see how you like it. The SEs are very different from DEs, so that comparisons are difficult.
+1 on the featherweight.
Remember that the Tech is mild and very *safe*, meaning you can apply a lot of pressure and get a great shave without any damage nor irritation. Regardless of the model, SE shaving is not as forgiving.