Lot of 50 US First Day Covers FDCs Picked From Inherited lifelong collection

Description

My great uncle was an avid stamp collector all of his life.  His collection spans 8 filing cabinet drawers.  We are not stamp collectors ourselves, so ability to answer questions is a bit thin.  However, if you do have any questions, please do not hesitate to contact me.
We have started sorting through his massive [cacheted] collection and have set aside 1500+ First Day Covers (FDCs)/First Day of Issues to support this listing.
While some FDCs are addressed, some are not.  All are different, US and International.  He seemed to have wide and varied interests — many UN and Swiss items.
Great way to jump start your stamp collection!