hiawatha gambles help

[hstavn]

could anyone help me find a year and who made this bike? the serial number is on the headtube it is m46541x30126666 it has a wald front hub a shimano three speed hub with a coaster brake, wald pedals, and dia comp brakes. any help would be greatly appreciated. i picked it up for 20 dollars thought it looked cool.

 

[Rustinkerer]

Made by Murray, and I think 1974, they started putting the serial #s there in the early 70s I believe.