Good god! What have they done to that Mosquito! The P40 in the background looks in a bad way too.

They are crude replica’s containing some original parts (in the Mossie’s case only the rotted remains of the wings and some bits). Well, it’s betetr than nothing! Saw them in 2008, interesting museum.

Oh, and there’s the great definite book on Otto Lilienthal, not only a bio, but also many many of his drawings for his first flying machines and a lot of handwritten annotations on flight of birds, 137 photo’s of his 19th century flying, etc.. To Fly Like A Bird, there’s several versions, but the illustrated German original by the Otto Lilenthal Museum is the best.

Probably more around now, than were originally built by DH in the first place.

Indeed. Five built pre-war by DH. Two surviving. Plus new-built to fly in UK and NZ, flying in US, with a possible second on the way. A replica sits under tarps at the DH Heritage Centre awaiting its turn in the restoration que. There may be others.

Auster I-TONE is indeed a model IV, formerly MT341. Last heard of as far as I can see in an accident in 1969. But there may be experts who know more.

I-AEKK is a G46-3B, formerly MM32086, last heard of in 1976.
I-AEHQ is a Fiat G46-4a, formerly MM53284.
I-ACMJ is an Aviamilano P.19 Scricciolo.
The indoor photos are all the same location, probably Campoformido.

One of the reason even working vintage ones are expensive, is that they still are immensely popular in glider competitions for timing of AAT tasks. A good clock will be gone in no time usually. You might find the occasional vintage clock on segelflug.de (kleinanzeigen), the specialist glider site.