Minerva Chronograph real or fake/frankenstein

I found this Minerva Chronograph but can't seem to find this exact reference. It comes with a glass caseback, which must be aftermarket, but what about the rest of the watch?

without the original caseback it is generelly a problem for collectors
and it reduces the value

unsigned bridge as said before

and for these reasons everyone will think about the case - but it could be original

dial and hands will be the conclusion, that they are original

The seller says that the case is not original, but the movement, dial, and hands are. The seller is asking for 550 euros. Is that a fair price?

so the seller can also tell you, wich movement it is

I have a Minerva chrono that I am pretty confident is all original, with a valjoux cal 71 mvt that doesn't have a signed bridge, but I am no expert on these.

beautiful V71 Chrono

in the good old family-buisiness-days mr. Frey was send in 1942 by his father to buy movements - he could not find
what he should search and so he decided to buy Valjoux 71 movements, but at these days there was no "market",
because after the time they used pocket watch movements for wristwatch chronos
fastly the watches became more smal - so the Valjoux 71 movements, after only producing not a lot chronos with
this movement, found there place somewhere in the warehouse


decades later, as bigger watches came in the focus they used these movements for a limited edition

mr Frey told this in a interview as these limited editions (also other watches with Venus movements) came on the market