Help to identify.

[1wheelshort]

I have what looks like a Murray frame. Serial number on bottom of crank read
MOD
21
50322

It looks like it was origanally blue with some sort of western rope looking paint markings.
Nothing fancy for options, no springer forks or anything. Odd part is it had a red and white mesinger S seat on it with the mesinger stamped on top rather than back of seat? I am picturing the seat is not original to bike. It has Musselman coaster brakes, Wald pedals and Carlisle Lightening Dart tires. None or all which may be original to the bike.
Thanks

 

[Freqman1]

Pics?

 

[Archie Sturmer]

The "21" may suggest a base model, ladies bike, such as a standard Sabre Flight.
The “U” in “MOU” may narrow the year down to 1955; Musselman hub likely orig.
Check the Murray serial number project thread.
https://thecabe.com/forum/threads/murray-serial-number-project.7014/

 

[1wheelshort]

Pics attached. Thanks

 

[Adamtinkerer]

Basic '60s Murray, aftermarket Wald chain guard, Schwinn seat.