Can anybody help with what type of bike this is?

[bsanderson]

 

[Archie Sturmer]

The type may be a middle weight "Space" bike.
From the mid 1960's. Its a girl's. NVG condition (rust). No tank, nice springer fork.
Murray built, maybe for Sears. Might be a chrome bike (too hard to tell).

 

[Archie Sturmer]

The chain guard looks like the older Sears "Spaceliner" style of 1964-1965.
https://thecabe.com/forum/threads/the-ultimate-sears-spaceliner-reference.35629/
Checkout model numbers 46971 (earlier) and 46972 (later).
A replacement girls tank may be less expensive than the boys.