Ancient? Ancient!
Such irons are referred to in the trade as "vintage", my dear. Ancient would be heated stones at worst and coal heated sad irons at best! *LOL*
Have had several vintage steam irons (Mary Proctor, General Electric), featured above, but they really aren't my thing as one prefers to iron damp laundry dry. For this I use vintage 1940's - 1905's dry irons like Proctor's "Never Lift" or "Champion" irons. Had a Westinghouse iron (the dry version of the above), but it burnt out after years of use.
Personally wouldn't use any of the old steam irons (anything before 1960 or so) as steam, as they do not produce the same steam as today's modern irons, IMHO. Also many will only steam within a certian range, that is if one wishes to steam iron silk, and the silk setting is not in the steam range, then it is no go.
My favourite vintage steam iron would be any of the Sunbeam's with self cleaning functions, and "burst of steam". IIRC, General Electric also made models with the same features.
Neat collection though! Now you need a copy of Mary Proctor's ironing book to make things complete.
L.