Bronze Age Gold from Wales

Bec 1 methanometer M&Q approval No.10 (class 1A). Serial No. '2054'. Black plastic box with small red button on top centre, front has metal plaque with title and makers name on and a clear plastic window at front top right to see gauge which is divided between O and S, black button on left side, back is held on by four screws, the holes of which are infilled with red wax, back also has two brass lined holes for screwing on of attachments.