Hi SBS,
Completely understand your demand and criteria in search of the true "in house" movement.Everyone in this big horology circle is searching for the answer.
Manufacturers are sturggling to cope with collectors demand and intention.This i view it as a micro topic behind the sales and demand of economy.Here it involve with arts and collectibility too.
Which manufacturer dares to admitt a full 100% in house movement.Even those independent with limited fund in R&D and etc,rely most in other huge supplier's supply in parts,in order to bring their cost down.
Big guys tends to have more parts produce themselves but still rely on many other parts suppliers.You can just predict to what extend how many percentage are produce in house.
And in my opinion there are none of the manufacturer really are true 100% able to produce 100% in house regardless of movement,casing and etc.
To me,in order enter the noble gate of my collection house.The criteria would be nearly 100% in house movement would do but weighting it in terms of,limited pieces,process behind the product,rarity,and price is vital.In fact it is not perpendicular,they can produce everything in the top of quality must go along with their cost inccur.Contraryily,you can not expect them to produce something which consume time,man power in R&D and production in a cheap manner.But in the wild world of horology,markets is competitie and demanding price friendly product.So,here lots of manufacturer will have entry level and middle class and top notch products.
After turning all over the horology real life circle in serach of the ultimate answer, i derive at this juncture a solution to my standard or guide-line in purchasing a time piece,
i)Buy sport-luxury wrist watch which set a a lower fix price leve,here it varies individually.(usually sport luxury watch are more on design base and trendy wave)therefore collectibility is low.Just in this category of watches are simply irressistable their evolution keep our temptation high.
II)Buy collectible watch usually are those in a higher fix price level,again here it varies individually.These are items tends to be keep for generation and withstand the changes of all sorts of humman factors.
I think you would not go wrong.In this world nearly everything would goes that way.YOU PAY FOR WHAT YOU GET!
I hope my little think thank would help you a little if not alot.
Thanks.
Warm regards,
BHK9