Yours must be an early one... I owned the same rifle as a child and it had the grooves to mount a .22 scope. The old Weaver N3 mount is what you need, but you probably have to drill and tap for the screws into your receiver.
Here is a photo of the mount, and also a photo of the mount that is attached to a .22 rifle of similar vintage...
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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