Re: trying to identify two old Conn's
The alto (N184740) is a non professional model made around 1970. Worth maybe $100 - $300 depending on the shape.
The tenor looks to be a Chu Berry tenor from the late 1920's. It is a professional horn and does have good value. It all depends on the condition of the horn, and that cannot be determined by the pictures you displayed. If it is in poor shape, maybe $600 - $900. If in very good shape it might be worth what a similar tenor went for this week on Ebay, about $1400 or so.
Until the horns are examined in detail, these rough values are all I can suggest.