What does British Weapon Trade do in AoE3?

Ships 4 Rocket; Ships 12 Redcoat; Light Cannon: hit points +50%, damage bonus against Artillery +1. The game says: "Ships 4 Rockets and 12 Redcoats. Significantly improves Light Cannon hitpoints."

Home City card

British Weapon Trade

British Weapon Trade (tech ID DEHCREVMXBritishWeapons) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Industrial Age. Effect: Ships 4 Rocket; Ships 12 Redcoat; Light Cannon: hit points +50%, damage bonus against Artillery +1. It hands over about 3,600 resources' worth.

Quick answers (3)

Which civilizations have the British Weapon Trade card?: Mexicans.
What does British Weapon Trade do in AoE3?: Ships 4 Rocket; Ships 12 Redcoat; Light Cannon: hit points +50%, damage bonus against Artillery +1. The game says: "Ships 4 Rockets and 12 Redcoats. Significantly improves Light Cannon hitpoints."
What is the tech ID of British Weapon Trade?: DEHCREVMXBritishWeapons.

Ships 4 Rockets and 12 Redcoats. Significantly improves Light Cannon hitpoints.

What it does

Ships 4 Rocket(unit)
Ships 12 Redcoat(unit)
Light Cannon: hit points +50%, damage bonus against Artillery +1

What it hands over

4 × Rocket600 each
12 × Redcoat100 each

Total ≈ 3,600 resources — units at their train cost, crates and animals at what they hold.

Cost: 11,500
Sent from: IV
Times it can be sent: 1
Game ID: DEHCREVMXBritishWeapons

In these decks

MexicansIV×1

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).