I have a limited supply of NOS original stainless steel Wittek thumb screw aviation clamps in 2 sizes. The first is -34 which will fit a 5/8" heater hose and is dated 1/59. The second is a -66 which will fit a 1 1/2" radiator hose and is dated 2/55. Both clamps have a "W" on the thumb screw.
$5 per clamp plus the ride or pick them up in Surrey B.C. Sorry but I do not do pay pal so payment will have to be a US postal money order.
Considering a worm clamp will run you a couple of bucks and looks terrible, these are a bargain and near impossible to find. As stated earlier, I have a limited supply and once they are gone you will be hard pressed to find them in these sizes.
Will swap clamp for clamp if you have any to fit a 3/8 fuel line as I need 8 to finish my car.