Sorry, haven't the technology to put a photo up, but have been given a button to identify. It's flattish (rather than ball) button, approx 7/8" diameter, with crown and gun, 12 spokes on the wheel. Old looking, brass colour but too light? Gun is not surmounted by Ubique, nor by H.A.C. There is a motto underneath but I cannot read it. The trail of the gun is on the right, barrel facing left, parallel to ground. Diagonally through the wheel, maybe resting on axle, is a rammer (sponger, or suchlike?). This has at each end what might be a coil of rope proud of the shaft. The highest part of this sits as high as the head-band of the crown.