HWD mark on small jug?

1

What was this jug for? Is it silver - it is heavy but no assay marks? It is well made.
Phil

17040287343185545751965362607046
170402873431855457519653626070461920×910 82.4 KB

17040288199142000961742339729453
170402881991420009617423397294531956×4128 322 KB

2
H.W.D into three circles

Henry William Dee, entered 1867