THIS IS A AUTHENTIC HORN TANK MADE FOR THE 1930S COLUMBIA BIKES AND FITS OTHERS,,I HAVE SEEN A FEW REPODUCTIONS SOLD ON OTHER AUCTIONS THAT ARE NOT OF THIS QUALITY OF THIS HEAVY STEEL MADE TANK,,READY TO PAINT OR CHROME,....THIS TANK WAS USED ON MANY 1930S 40S AND SOME OTHER COLUMBIA BIKES LIKE THE COLUMBIA CUSTOM DELUXE WESTFIELD STERLING HARFORD AND OTHERS,,GREAT ITEM FOR RAT ROD OR OTHER CUSTOM MADE BIKES,,,IT IS 22 1/4 INCHES LONG BY 3 3/4 WIDE UP AT THE FRONT OF THE WIDEST PART, THIS IS A COLUMBIA REPLACEMENT TANK. THIS TANK IS NOT MADE ANY MORE AND AND IS A RARE FIND.