you should educate yourself more on the subject and invest in the best solution for you.
Blown in cellulose is a good insulation for homes like that. They can take infared pictures to see where any voids may be if the installers screw up I suppose. find a reputable company. You'll save a lot of heating fuel by insulating your walls. I hope you have some insulation in the attic already.
Back then houses did have real thick plaster walls, they vary from place to place as well as time period or builder, but a thick plaster wall is not neccesarily a good insulated wall.
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