This is a vintage 1955 Columbia 3 Cavalier Star Deluxe balloon tire bicycle.  This bicycle is un-tuned but isn't too far from being a decent rider.  It will need new tires, but the bike itself is in decent shape.  The paint isn't a1, but there's nothing more than surface rust where the paint has been worn off.  The rims do need either a rechrome, or paint, as they don't have much shine left.  The wheels seem true with no broken spokes.  The Bendix coaster brake spins well, but doesn't have a snappy stop to it.  The bars need a rechrome too, but aren't bent and seem original.
This bicycle has that great chainguard with the self oiling system.  "Lubri Klean".  The chain runs through two small felt pieces that you would douse with oil regularly.  Hands free chain oiling! 
Original paint was a blue with cream accents.  The downtube decal is in great shape, but the tank and chainguard decals are basically missing.
Headbadge is not perfect.
***The fork truss is missing the rods. 
***The fender light is also missing. 
***The ends and tips of the fenders look a bit chewed. 

This Cavalier has the Columbia built in chainguard, air flow tank, Deluxe Air flow full coverage Chainguard,
Original model: A 19T (full coverage chainguard
                        Three Star Deluxe Motobike

Measurements:

Seat Tube - 18"

Top Tube - 22.5

Stand-over Height - about 31"

Specifications:

Seatpost - original, good shape

Saddle - Person's tan top springer, springs and rails look like they've been sprayed silver

Stem - original quill stem, no chrome

Handlebars - 26.5" wide cruiser bars, not much chrome left.  Original black Columbia grips, ok shape but both have an inch long crack along the inside seam.

Crankset - original 1 piece steel crankset, 5 arm chainring

Pedals - block style pedals, worn, but usable

hubs - Bendix coaster brake hub (brake arm has Bendix in red), front hub is unmarked but is a wider diameter center section
rims - 26" balloon style steel rims, no chrome left, but not rusted out either

tires - Western flyer blackwall 26 x 2.125 tires, ok shape, but the front needs a new tube.  some cracking, but definitely rideable

Serial #59831

Reference #BC1