I have 16 vintage Malco G-Clamps for sale.
10 @ 10 inch (Weight 2.7kg each)
6 @ 8 inch (Weight 2.2kg each)
Malco is, or was an Australian tool company based in Sydney.
I believe their clamps were produced up until the late 70's.
They are still highly regarded, both by boatbuilders and woodworkers alike.
They are listed on Gumtree as well.
Price: $430