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webb or weigh

In England, at least as early as 1545, a unit describing a quantity of window glass from the Rhineland. It occurs in the English customs books. The entry for 1660 is typical:

Glasses for Windows vocat...Renish the weigh or webb cont sixty bunches.

“A Subsidy granted to the King of Tonnage and Poundage and other summes of Money payable upon Merchandize Exported and Imported.”
A statute from the 12th year of Charles II, 1660. The selection is from the Rates of Merchandizes, which is not part of the statute proper but developed from it. Both are printed in:
Statutes of the Realm, Volume 5: 1628-80, John Raithby, editor.
London: 1819. Page 191.

Other spellings include wabe, way and waye. Is this the same as the weigh of, say, cheese or lead? What is the size of a bunch of glass?