late 50's-early 60's RCA color TV remote control battery

[drh4683]

Does anyone know where to find the proper battery for the early RCA remote controls? Ive got a '61 CTC-11 remote set. Its one of those remotes with the clear buttons. I never was able to locate a battery for it. Not sure if one still exists. I don't want to hack the remote to make it work with a modern battery. I don't believe its a cylindrical 9volt. It should use an RCA battery VS 163 which is a 4.2 volt if Im not mistaken. I could go with 3 AAA's, but would like to find the proper one if its still available. Any help is appriciated.