@OldSchoolEuph
As part of our initial design work for our Jaeger trumpets we bought dozens of trumpets, mainly from the 1920s to 1990s. Some went straight back again (thank you Dillon Music!), some were kept for a few months, some we still have. We visited factories and workshops in many parts of the world collecting experimental and production models. We were investigating what gave each model its specific response, and deciding whether or not we wanted that feature. Then we looked at exaggerating each feature we liked and dampening those we didn’t.
Those were the reasons for our collection.
And, from time to time, we sell some of these instruments that were helpful in our quest. At the moment we have a Getzen 900H and an Amati pocket we no longer need.