Very close. It is a two-position Trangia multi-fuel stove holder. At its simplest, the rectangular slot on one side fits over the table upright, just visible on the left of the first photo below. The circular cut out clamps down on the lower rim of the stove to stop it moving about.
If there is no table, then an attachment anchors the holder to the centreboard casing, as in photo 2 below. If the centreboard is up, the attachment can be slotted over the downhaul fairlead and if the centreboard is down, it still sits reasonably happily over the casing but is not quite so secure. Photo 3 shows the centreboard attachment more clearly.
Frank and Margaret Dye's books emphasise how many boating accidents are caused by scalding. This lessens the risk but does not eliminate it.