The GC series of pumps are Type C, fitted to various Derwents, Nenes and Goblins. Dowty on the Goblin was replaced when the Goblin became the Mk.III, I believe.
I suggest that a ‘GB’ would be a Type B. Doesn’t answer your question, but googling for Lucas Type B, I found one that might be it – for Hunter & Canberra it says.
Jet Art Aviation links from google don’t work for me.
No don’t do it! I don’t like facebook.
Firstly: For the part-number starting 82, try Curtiss Model 82 Seamew. I think the RN, FAA had some of these. As far as I can remember, AM, you had another part that I had suggested was Curtiss and you were going to go look it up next time you were at Kew. Not sure that you came back to it. Maybe the same part?
On your quadrant: I don’t think there is any doubt it is Boston/Havoc. The reason why it doesn’t have the rivet line is because it was never installed; its a spare. The main bolts do match well.
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