What is the value of an American Seating Company wooden folding chair from probably the 50's?

Our church uses the wooden seated metal folding chair made by American Seating Company of Grand Rapid MI. We have been looking into replacement costs should the chairs be damaged. The chairs are very high quality and have held up for over 50 years. We have found comparable comfort plastic folding chairs for $60 each, wood frame wood seated chairs for $100+ again comparable quality.

The only direct replacement cost we could find was for the rubber foot on the chair legs, Part #KGAM60 $2.08 each or 8.32 per chair. Hope this helps.