Aqua unembossed bottle, contents identifiable from remnants of label. This says ‘Yorkshire sauce/ For Enri[ich]ing Gr[avies…]’ Other words visible lower on the label include ‘wholes[aler/s] and…’/ ‘fish sauce’/ ‘delicious’/ ‘hashes’ etc.
The bottle would have had a glass stopper wedged in a cork ring.