Sentence:  6. "Item", That no Trinckerman or other Fisherman shall buy any <WSD>Trincke</WSD>, or take to receive any Copy under the seal of the Office of Mayoralty until he be allowed and thought fit by the Lord Mayor of LONDON, or by his Substitute, the Water-Bailiff for the Time being, 
Meaning of the word marked with <WSD> tags:  A kind of fishing net.