Exhibit A, shall we say, is a 3 way actuated valve, with an ITT tag, I would say of European descent.  We have contacted ITT Engineered Valves directly, and nobody there recognizes it.
With the history of ITT, I'm guessing this was a valve product line that was sold off to someone else (much as the old ITT-AC butterfly valves were sold to Rodney Hunt).  It's also possible that it's someone else's valve that was simply nameplated by ITT for a special job.
But I'm stumped at this point - does anyone recognize that valve, and have an idea of who owns the product now?  Sometimes, experienced eyes looking at an old item can recognize it.
The tag calls it a PSVD 65/63.
Identifying of older valves with unreadable tags or signs, and no other information than what you physically can see from outside is unfortunately a common problem.
(By the way your ND16 could be German casting mark for 'Nenndruck DIN PN16', eg flange measurements equal to modern pressure class European EN PN16, but not necessarily at a standard building length for the valve - try German ITT sources for further identifying, or see the Clorius range below)
All relevant outside measurements, building length, flange measurements, topfalnge measurements, including for all flanges bolt circle diameter, bolthole diameter, number of bolts, flange thickness, measurement if uneven distribution of bolts, spindel top form with all outer measurements etc.
All necessary data about process, expected performance, fluid and other relevant information dimensioning a new valve.

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