This free pattern originally published in the Woolco Knitting & Crocheting Manual, in 1916.

MATERIAL-16 skeins Woolco Shetland Floss. No. 3 ½ Woolco hook.
Make a chain of 70 stitches.
1ST ROW-Make a chain of 3 stitches; in each of next three stitches, make a treble (this makes 4 trebles, counting 3 chains for each treble). In the 5th stitch, make a shell of 4 trebles, with 1 chain in the center of the shell. In the next 4 chains, 4 trebles; then a shell; then 4 trebles; then a shell all the way across, ending with 4 trebles.
In the next row, as in the 1st, chain 3; make a treble, working the treble, however, around those in the former row; make a shell of 4 in the center of the shell of former row, and repeat to the end of row.
Work back and forth until there are 65 rows.
Finish with a long fringe.
Other great shawl patterns from Woolco Knitting & Crocheting Manual.
Scarf I
Square Shawl
Scarf II
Yoke Cape
Cape
Nubia