I agree that encapsulated material looks very odd on exhibition.  Most
curators and exhibition designer would no doubt agree.  Encapsulation is
for storage and handling.

Dianne van der Reyden of CAL, Smithsonian (301-238-3700  ex 147) did a
great deal of work on the technology and treatment of Victorian era
Valentines, especially fold-out Valentines.

Timothy Vitale
Paper and Photograph Conservator
& Preservation Consultant
Aptos & Felton, CA
408-684-2731 office
408-335-2541 studio afts and eves