Shawn and Dave are right on
Elfin Badged strap steel frame I’m thinking 1918 to early 20’s
Many list this version as early 30’s but by the 30’s
Colson was manufacturing all Tube frames
Elfin was a version or a Run off of the “ Fairy “line
Rover and Brownie were 2 others that all looked very
Similar in construction and Features
commonly see these sell from $100-$125
Excellent condition in regards to paint ,grips , saddle condition
And rubber on wheels and pedals possibly up to $175
To maybe $200
Nice find
mark