Caradco windows circa 1964, windows are in good shape except for about 10 crank mechanism

Thanks for contacting us. Looks like you have a straight single arm operator, but it's a very old style. They haven't made this in a long time. 

You may be able to use something like our 39-027E and 39-028E, but it would require altering the sill trim to accept the new style base. You may also need a new sash track like the 39-533.